Add Gitea Actions workflow for build and deploy

Uses buildah to build/push to Harbor, then kubectl apply for deployment.
Replaces the old Woodpecker CI pipeline.

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

.gitea/workflows/deploy.yaml

@@ -0,0 +1,36 @@
+name: Build and Deploy
+
+on:
+  push:
+    branches: [main]
+
+jobs:
+  build-and-deploy:
+    runs-on: ubuntu-latest
+    container:
+      image: quay.io/buildah/stable
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Build image
+        run: |
+          IMAGE=harbor.scottyah.com/scottyah/blog
+          buildah bud -t $IMAGE:${{ github.sha }} -t $IMAGE:latest .
+
+      - name: Push image
+        run: |
+          IMAGE=harbor.scottyah.com/scottyah/blog
+          buildah login -u "${{ secrets.HARBOR_USERNAME }}" -p "${{ secrets.HARBOR_PASSWORD }}" harbor.scottyah.com
+          buildah push $IMAGE:${{ github.sha }}
+          buildah push $IMAGE:latest
+
+      - name: Deploy
+        run: |
+          curl -LO "https://dl.k8s.io/release/$(curl -Ls https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl"
+          chmod +x kubectl
+          mkdir -p ~/.kube
+          echo "${{ secrets.KUBECONFIG_DATA }}" | base64 -d > ~/.kube/config
+          sed -i "s|harbor.scottyah.com/scottyah/blog:latest|harbor.scottyah.com/scottyah/blog:${{ github.sha }}|" k8s.yaml
+          ./kubectl apply -f k8s.yaml
+          ./kubectl rollout status deployment/blog-dep -n blog --timeout=120s