Add CI/CD for auto-deployment of blog

.gitea/workflows/build.yml

@@ -0,0 +1,60 @@
+name: Build and Push Docker Image
+
+on:
+  push:
+    branches:
+      - main
+
+env:
+  REGISTRY: git.cbraaten.dev
+  IMAGE_NAME: git.cbraaten.dev/caleb/blog
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: read
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Get short SHA
+        id: sha
+        run: echo "short_sha=$(git rev-parse --short HEAD)" >> $GITHUB_OUTPUT
+
+      - name: Print Secrets
+        run: |
+            if [ -z "${{ secrets.REGISTRY_USERNAME }}" ]; then
+              echo "ERROR: REGISTRY_USERNAME secret is not set"
+              exit 1
+            else
+              echo "✓ REGISTRY_USERNAME is set"
+            fi
+            if [ -z "${{ secrets.REGISTRY_PASSWORD }}" ]; then
+              echo "ERROR: REGISTRY_PASSWORD secret is not set"
+              exit 1
+            else
+              echo "✓ REGISTRY_PASSWORD is set"
+            fi
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ secrets.REGISTRY_USERNAME }}
+          password: ${{ secrets.REGISTRY_PASSWORD }}
+
+      - name: Build and Push Docker Image
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          file: ./Dockerfile
+          push: true
+          tags: |
+            ${{ env.IMAGE_NAME }}:latest
+            ${{ env.IMAGE_NAME }}:${{ steps.sha.outputs.short_sha }}