Switch runner target to Apple Silicon Mac Mini

Update workflows from linux/arm64 to macOS/arm64 runner labels.
Replace GitHub Actions for Docker setup with direct commands
compatible with Docker Desktop on macOS.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.gitea/workflows/build.yaml

@@ -6,6 +6,8 @@
 # Produces:
 #   - Installer container image → Docker Hub (svrnty/talos-rpi5:<tag>)
 #   - Raw disk image → Gitea release (metal-arm64.raw.zst)
+#
+# Runner: Apple Silicon Mac Mini (self-hosted, macOS, arm64)
 
 name: Build Talos CM5 Image
 
@@ -16,21 +18,21 @@ on:
 
 jobs:
   build:
-    runs-on: [self-hosted, linux, arm64]
+    runs-on: [self-hosted, macOS, arm64]
     timeout-minutes: 180
 
     steps:
       - name: Checkout
         uses: actions/checkout@v4
 
+      - name: Verify Docker is running
+        run: docker info
+
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
+        run: docker buildx create --use --name talos-builder --driver docker-container || docker buildx use talos-builder
 
       - name: Login to Docker Hub
-        uses: docker/login-action@v3
-        with:
-          username: ${{ secrets.REGISTRY_USERNAME }}
-          password: ${{ secrets.REGISTRY_PASSWORD }}
+        run: echo "${{ secrets.REGISTRY_PASSWORD }}" | docker login -u "${{ secrets.REGISTRY_USERNAME }}" --password-stdin
 
       - name: Extract version tag
         id: version

.gitea/workflows/check-updates.yaml

@@ -14,7 +14,7 @@ on:
 
 jobs:
   check-updates:
-    runs-on: [self-hosted, linux, arm64]
+    runs-on: [self-hosted, macOS, arm64]
     timeout-minutes: 10
 
     steps:

README.md

@@ -50,20 +50,27 @@ A weekly scheduled workflow checks for new Talos and RPi kernel releases and cre
 | `REGISTRY_USERNAME` | Docker Hub username (org-level) |
 | `REGISTRY_PASSWORD` | Docker Hub access token (org-level) |
 
-## Runner Setup (ASUS GX10)
+## Runner Setup (Apple Silicon Mac Mini)
 
-The ARM64 build runner needs:
-- Docker + Docker Buildx
-- Gitea `act_runner` registered with labels: `self-hosted`, `linux`, `arm64`
+The build runner needs:
+- Docker Desktop with Buildx (arm64 native)
+- Gitea `act_runner` registered with labels: `self-hosted`, `macOS`, `arm64`
 - Sufficient disk space for kernel builds (~20GB)
 
 ```bash
-# Install act_runner
-curl -sL https://gitea.com/gitea/act_runner/releases/latest/download/act_runner-linux-arm64 -o act_runner
+# Install act_runner via Homebrew
+brew install act_runner
+
+# Or download directly
+curl -sL https://gitea.com/gitea/act_runner/releases/latest/download/act_runner-darwin-arm64 -o act_runner
 chmod +x act_runner
 
 # Register
-./act_runner register --instance <gitea-url> --token <runner-token>
+./act_runner register \
+  --instance https://git.openharbor.io \
+  --token <runner-token> \
+  --name mac-mini \
+  --labels self-hosted,macOS,arm64
 
 # Run as service
 ./act_runner daemon