feat: add GitHub Actions workflows for code quality and automation (#2)

common-file-check/README.md

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+# ivuorinen/actions/common-file-check
+
+## Common File Check
+
+### Description
+
+A reusable action to check if a specific file or type of files exists in the repository.
+Emits an output 'found' which is true or false.
+
+### Inputs
+
+| name           | description                             | required | default |
+| -------------- | --------------------------------------- | -------- | ------- |
+| `file-pattern` | <p>Glob pattern for files to check.</p> | `true`   | `""`    |
+
+### Outputs
+
+| name    | description                                                    |
+| ------- | -------------------------------------------------------------- |
+| `found` | <p>Indicates if the files matching the pattern were found.</p> |
+
+### Runs
+
+This action is a `composite` action.
+
+### Usage
+
+```yaml
+- uses: ivuorinen/actions/common-file-check@main
+  with:
+    file-pattern:
+    # Glob pattern for files to check.
+    #
+    # Required: true
+    # Default: ""
+```

common-file-check/action.yml

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+---
+# yaml-language-server: $schema=https://json.schemastore.org/github-action.json
+name: Common File Check
+description: |
+  A reusable action to check if a specific file or type of files exists in the repository.
+  Emits an output 'found' which is true or false.
+author: 'Ismo Vuorinen'
+branding:
+  icon: search
+  color: gray-dark
+
+inputs:
+  file-pattern:
+    description: 'Glob pattern for files to check.'
+    required: true
+
+outputs:
+  found:
+    description: 'Indicates if the files matching the pattern were found.'
+    value: ${{ steps.check-files.outputs.found }}
+
+runs:
+  using: composite
+  steps:
+    - name: Check for Files
+      id: check-files
+      shell: bash
+      run: |
+        if find . -name "${{ inputs.file-pattern }}" | grep -q .; then
+          echo "found=true" >> $GITHUB_OUTPUT
+        else
+          echo "found=false" >> $GITHUB_OUTPUT
+        fi