feat: fw update gitea to use a docker image with puppeteer, webp and avif deps

hosts/fw/modules/gitea-runner-image-README.md

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+# Gitea Runner Docker Image
+
+This directory contains the Dockerfile for the custom Gitea Actions runner image that includes additional dependencies needed for CI workflows.
+
+## Included Tools
+
+- **Base**: `shivammathur/node:latest` (includes Node.js and common development tools)
+- **Chrome dependencies**: Full Puppeteer/Chromium dependencies for headless browser testing
+- **webp**: WebP image format tools (`cwebp`, `dwebp`)
+- **libavif-bin**: AVIF image format tools (`avifenc`, `avifdec`)
+
+## Building the Image
+
+```bash
+cd hosts/fw/modules
+docker build -f gitea-runner.Dockerfile -t git.cloonar.com/infrastructure/gitea-runner:latest .
+```
+
+## Pushing to Registry
+
+First, authenticate with your Gitea container registry:
+
+```bash
+docker login git.cloonar.com
+```
+
+Then push the image:
+
+```bash
+docker push git.cloonar.com/infrastructure/gitea-runner:latest
+```
+
+## Using the Image
+
+The image is already configured in `gitea-vm.nix` and will be used automatically by the Gitea Actions runners for jobs labeled with `ubuntu-latest`.
+
+## Updating the Image
+
+When you need to add new dependencies:
+
+1. Edit `gitea-runner.Dockerfile`
+2. Rebuild the image with the commands above
+3. Push to the registry
+4. Restart the runner VMs: `systemctl restart microvm@git-runner-1.service microvm@git-runner-2.service`