Add Github CI templated and workflow.

.github/workflows/bump-date.yml

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+#
+# bump-date.yml
+# Bump the distribution date once per day
+#
+
+name: Bump Distribution Date
+
+on:
+  schedule:
+    - cron: '0 0 * * *'
+
+jobs:
+  bump_date:
+    name: Bump Distribution Date
+    if: github.repository == 'MarlinFirmware/Marlin'
+
+    runs-on: ubuntu-latest
+
+    steps:
+
+    - name: Check out bugfix-2.0.x
+      uses: actions/checkout@v2
+      with:
+        ref: bugfix-2.0.x
+
+    - name: Bump Distribution Date
+      run: |
+        # Inline Bump Script
+        DIST=$( date +"%Y-%m-%d" )
+        eval "sed -E -i 's/(#define +STRING_DISTRIBUTION_DATE) .*$/\1 \"$DIST\"/g' Marlin/src/inc/Version.h" && \
+        git config user.name "${GITHUB_ACTOR}" && \
+        git config user.email "${GITHUB_ACTOR}@users.noreply.github.com" && \
+        git add . && \
+        git commit -m "[cron] Bump distribution date ($DIST)" && \
+        git push

.github/workflows/check-pr.yml

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+#
+# check-pr.yml
+# Close PRs directed at release branches
+#
+
+name: PR Bad Target
+
+on:
+  pull_request:
+    branches:
+    - 2.0.x
+
+jobs:
+  bad_target:
+    name: PR Bad Target
+    if: github.repository == 'knutwurst/Marlin-2-0-x-Anycubic-i3-MEGA-S'
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: peter-evans/close-pull@v1
+      with:
+        delete-branch: false
+        comment: >
+          Thanks for your contribution! Unfortunately we can't accept PRs directed at release branches. We make patches to the bugfix branches and only later do we push them out as releases.
+
+          Please redo this PR starting with the `bugfix-2.0.x` branch and be careful to target `bugfix-2.0.x` when resubmitting the PR.
+
+          It may help to set your fork's default branch to `bugfix-2.0.x`.
+
+          See [this page](http://marlinfw.org/docs/development/getting_started_pull_requests.html) for full instructions.

.github/workflows/close-stale.yml

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+#
+# close-stale.yml
+# Close open issues after a period of inactivity
+#
+
+name: Close Stale Issues
+
+on:
+  schedule:
+  - cron: "22 1 * * *"
+
+jobs:
+  stale:
+    name: Close Stale Issues
+    if: github.repository == 'MarlinFirmware/Marlin'
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/stale@v3
+      with:
+        repo-token: ${{ secrets.GITHUB_TOKEN }}
+        stale-issue-message: 'This issue is stale because it has been open 30 days with no activity. Remove stale label / comment or this will be closed in 5 days.'
+        days-before-stale: 30
+        days-before-close: 5
+        stale-issue-label: 'stale-closing-soon'
+        exempt-issue-labels: 'T: Feature Request'

.github/workflows/lock-closed.yml

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+#
+# lock-closed.yml
+# Lock closed issues after a period of inactivity
+#
+
+name: Lock Closed Issues
+
+on:
+  schedule:
+    - cron: '0 1/13 * * *'
+
+jobs:
+  lock:
+    name: Lock Closed Issues
+    if: github.repository == 'MarlinFirmware/Marlin'
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: dessant/lock-threads@v2
+      with:
+        github-token: ${{ github.token }}
+        process-only: 'issues'
+        issue-lock-inactive-days: '60'
+        issue-exclude-created-before: ''
+        issue-exclude-labels: 'no-locking'
+        issue-lock-labels: ''
+        issue-lock-comment: >
+          This issue has been automatically locked since there
+          has not been any recent activity after it was closed.
+          Please open a new issue for related bugs.
+        issue-lock-reason: ''

.github/workflows/test-builds.yml

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+#
+# test-builds.yml
+# Do test builds to catch compile errors
+#
+
+name: CI
+
+on:
+  pull_request:
+    branches:
+    - master
+    paths-ignore:
+    - config/**
+    - data/**
+    - docs/**
+    - '**/*.md'
+  push:
+    branches:
+    - master
+    paths-ignore:
+    - config/**
+    - data/**
+    - docs/**
+    - '**/*.md'
+
+jobs:
+  test_builds:
+    name: Run All Tests
+    if: github.repository == 'knutwurst/Marlin-2-0-x-Anycubic-i3-MEGA-S'
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        test-platform:
+        # Knutwurst Base Environments
+
+        - i3_MEGA_1stgen
+        - i3_MEGA_1stgen_TMC
+        - i3_MEGA_1stgen_BLTOUCH_10
+        - i3_MEGA_1stgen_BLTOUCH_11
+        - i3_MEGA_1stgen_TMC_BLTOUCH_10
+        - i3_MEGA_1stgen_TMC_BLTOUCH_11
+        - i3_MEGA
+        - i3_MEGA_TMC
+        - i3_MEGA_BLTOUCH_10
+        - i3_MEGA_BLTOUCH_11
+        - i3_MEGA_TMC_BLTOUCH_10
+        - i3_MEGA_TMC_BLTOUCH_11
+        - i3_MEGA_S
+        - i3_MEGA_S_TMC
+        - i3_MEGA_S_BLTOUCH_10
+        - i3_MEGA_S_BLTOUCH_11
+        - i3_MEGA_S_TMC_BLTOUCH_10
+        - i3_MEGA_S_TMC_BLTOUCH_11
+        - i3_MEGA_S_DGUS
+        - i3_MEGA_S_DGUS_TMC
+        - i3_MEGA_S_DGUS_BLTOUCH_10
+        - i3_MEGA_S_DGUS_BLTOUCH_11
+        - i3_MEGA_S_DGUS_TMC_BLTOUCH_10
+        - i3_MEGA_S_DGUS_TMC_BLTOUCH_11
+        - i3_MEGA_X
+        - i3_MEGA_X_TMC
+        - i3_MEGA_X_BLTOUCH_10
+        - i3_MEGA_X_BLTOUCH_11
+        - i3_MEGA_X_TMC_BLTOUCH_10
+        - i3_MEGA_X_TMC_BLTOUCH_11
+        - i3_MEGA_P
+        - i3_MEGA_P_TMC
+        - i3_MEGA_P_BLTOUCH_10
+        - i3_MEGA_P_BLTOUCH_11
+        - i3_MEGA_P_TMC_BLTOUCH_10
+        - i3_MEGA_P_TMC_BLTOUCH_11
+
+        #- DUE
+        #- esp32
+        #- linux_native
+        #- mega2560
+        #- teensy31
+        #- teensy35
+        #- SAMD51_grandcentral_m4
+
+        # Extended AVR Environments
+
+        #- FYSETC_F6_13
+        #- mega1280
+        #- rambo
+        #- sanguino1284p
+        #- sanguino644p
+
+        # Extended STM32 Environments
+
+        #- STM32F103RC_btt
+        #- STM32F103RC_btt_USB
+        #- STM32F103RE_btt
+        #- STM32F103RE_btt_USB
+        #- STM32F103RC_fysetc
+        #- STM32F103RC_meeb
+        #- jgaurora_a5s_a1
+        #- STM32F103VE_longer
+        #- STM32F407VE_black
+        #- STM32F401VE_STEVAL
+        #- BIGTREE_BTT002
+        #- BIGTREE_SKR_PRO
+        #- BIGTREE_GTR_V1_0
+        #- mks_robin
+        #- mks_robin_stm32
+        #- ARMED
+        #- FYSETC_S6
+        #- STM32F070RB_malyan
+        #- malyan_M300
+        #- mks_robin_lite
+        #- FLYF407ZG
+        #- rumba32
+        #- mks_robin_pro
+        #- STM32F103RET6_creality
+        #- LERDGEX
+        #- mks_robin_nano35
+
+        # Put lengthy tests last
+
+        #- LPC1768
+        #- LPC1769
+
+        # STM32 with non-STM framework. both broken for now. they should use HAL_STM32 which is working.
+
+        #- STM32F4
+        #- STM32F7
+
+        # Non-working environment tests
+        #- at90usb1286_cdc
+        #- at90usb1286_dfu
+        #- STM32F103CB_malyan
+        #- mks_robin_mini
+
+    steps:
+
+    - name: Select Python 3.7
+      uses: actions/setup-python@v1
+      with:
+        python-version: '3.7' # Version range or exact version of a Python version to use, using semvers version range syntax.
+        architecture: 'x64' # optional x64 or x86. Defaults to x64 if not specified
+
+    - name: Install PlatformIO
+      run: |
+        pip install -U https://github.com/platformio/platformio-core/archive/develop.zip
+        platformio update
+
+    - name: Check out the PR
+      uses: actions/checkout@v2
+
+    - name: Run ${{ matrix.test-platform }} Tests
+      run: |
+        # Inline tests script
+        chmod +x buildroot/bin/*
+        chmod +x buildroot/tests/*
+        export PATH=./buildroot/bin/:./buildroot/tests/:${PATH}
+        run_tests . ${{ matrix.test-platform }}

.github/workflows/unlock-reopened.yml

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+#
+# unlock-reopened.yml
+# Unlock an issue whenever it is re-opened
+#
+
+name: "Unlock reopened issue"
+
+on:
+  issues:
+    types: [reopened]
+
+jobs:
+  unlock:
+    name: Unlock Reopened
+    if: github.repository == 'MarlinFirmware/Marlin'
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: OSDKDev/unlock-issues@v1.1
+      with:
+        repo-token: "${{ secrets.GITHUB_TOKEN }}"