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

common-file-check/README.md

@@ -0,0 +1,36 @@
+# 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: ""
+```