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

docker-publish/README.md

@@ -0,0 +1,42 @@
+# ivuorinen/actions/docker-publish
+
+## Docker Publish
+
+### Description
+
+Publish a Docker image to GitHub Packages and Docker Hub.
+
+### Inputs
+
+| name       | description                                                 | required | default |
+| ---------- | ----------------------------------------------------------- | -------- | ------- |
+| `registry` | <p>Registry to publish to (dockerhub, github, or both).</p> | `true`   | `both`  |
+| `nightly`  | <p>Is this a nightly build? (true or false)</p>             | `false`  | `false` |
+
+### Outputs
+
+| name       | description                               |
+| ---------- | ----------------------------------------- |
+| `registry` | <p>Registry where image was published</p> |
+
+### Runs
+
+This action is a `composite` action.
+
+### Usage
+
+```yaml
+- uses: ivuorinen/actions/docker-publish@main
+  with:
+    registry:
+    # Registry to publish to (dockerhub, github, or both).
+    #
+    # Required: true
+    # Default: both
+
+    nightly:
+    # Is this a nightly build? (true or false)
+    #
+    # Required: false
+    # Default: false
+```