devops: add release_notes detailing new docker build-and-push automation and gitea workflow integration for rbvtopuddinggitea-act_runner, including usage, tagging, and required packages.

RELEASE_NOTES.md

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+# Release Description
+
+## Added Docker Build and Push Automation
+
+This release introduces a new build and push script to streamline the Docker image creation and publishing process for the `rbvtopudding/gitea-act_runner` image.
+
+### New Features
+
+**`build-and-push.sh` - Automated Build and Push Script**
+- Automated Docker image build process for `rbvtopudding/gitea-act_runner`
+- Automatic push to Docker Hub after successful build
+- Flexible tagging support (defaults to `latest` if no tag specified)
+- Error handling with `set -euo pipefail` for robust execution
+- Progress messages for build and push operations
+
+### Usage
+
+**Manual Execution:**
+```bash
+# Build and push with default "latest" tag
+./build-and-push.sh
+
+# Build and push with specific tag
+./build-and-push.sh v1.0.0
+```
+
+**Automated via Gitea Workflow:**
+The script is integrated with the Gitea workflow (`.gitea/workflows/build-and-push.yaml`) and will automatically build and push images when releases are published, using the release tag as the Docker image tag.
+
+### What's Built
+
+The Docker image is based on `gitea/act_runner:latest` with the following additional packages:
+- `nodejs` - JavaScript runtime
+- `npm` - Node package manager
+- `docker` - Docker CLI
+
+### Requirements
+
+- Docker must be installed and running
+- Must be logged into Docker Hub (`docker login`) before running the script
+