WIP

.editorconfig

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+[*]
+indent_style = space
+indent_size = 2
+end_of_line = lf
+charset = utf-8
+max_line_length = 80
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[**.{md,rst}]
+trim_trailing_whitespace = false
+
+[.git*]
+indent_style = tab
+
+[{**.*sh,test/run}]
+indent_style = tab
+indent_size = 4
+shell_variant      = bash
+binary_next_line   = true  # like -bn
+switch_case_indent = true  # like -ci
+space_redirects    = true  # like -sr
+keep_padding       = false  # like -kp
+end_of_line        = lf
+charset            = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true

Dockerfile

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+FROM python:3.7-buster
+
+ENV PIO_URL https://github.com/platformio/platformio-core/archive/develop.zip
+
+RUN pip install -U ${PIO_URL} \
+    && platformio update
+
+COPY bin/entrypoint.sh /bin/entrypoint.sh
+
+ENTRYPOINT ["/bin/entrypoint.sh"]

action.yml

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+# action.yml
+name: 'mabg'
+description: 'Marlin auto build generation with github action'
+inputs:
+  branch: # branch of Marlin repo to use
+    description: 'Marlin branch repo'
+    required: false
+    default: '2.0.x'
+runs:
+  using: 'docker'
+  image: 'Dockerfile'
+  args:
+    - ${{ inputs.branch }}

bin/entrypoint.sh

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+#!/bin/bash
+
+function clone () {
+	git clone https://github.com/MarlinFirmware/Marlin.git -b $1
+}
+
+clone