Wrote first version

Author: ZacJW

Dockerfile

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+FROM python:3.8
+
+COPY inline-css.py /inline-css.py
+COPY entrypoint.sh /entrypoint.sh
+
+ENTRYPOINT ["/entrypoint.sh"]

README.md

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+# inline-css-action
+
+Converts HTML files to use inline styling.
+
+## Usage
+
+```yaml
+      - uses: ZacJW/[email protected]
+        with:
+          files: '["test.html", "dir/*.html"]'
+```
+
+This example will convert `test.html` and all `.html` files in `dir/` to use inline styling.
+
+## Inputs
+
+### `files`
+
+**Required**. A JSON list of paths to html files to convert. They will be overwritten to use inline styling. Paths may be glob patterns, in which case all matching files will be converted and overwritten.

action.yml

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+name: "Inline-CSS"
+description: "Convert HTML files to use inline styling"
+inputs:
+  files:
+    description: "A JSON list of paths to HTML files to convert"
+    required: true
+runs:
+  using: 'docker'
+  image: 'Dockerfile'
+branding:
+  icon: file-text
+  color: white

entrypoint.sh

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+#!/bin/bash -e
+
+pip3 install premailer
+
+python3 /inline-css.py

inline-css.py

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+#!/bin/python3
+
+import premailer, json, os, pathlib
+
+REPO_PATH = pathlib.Path(os.environ['GITHUB_WORKSPACE'])
+FILES_LIST = json.loads(os.environ['INPUT_FILES'])
+
+pm = premailer.Premailer()
+
+for file_path_str in FILES_LIST:
+    file_path_list = REPO_PATH.glob(file_path_str)
+    for file_path in file_path_list:
+        with open(file_path_list, 'r') as file:
+            html = pm.transform(file.read())
+        with open(file_path_list, 'w') as file:
+            file.write(html)