added workflow

.gitea/workflows/daily-build.yml

@@ -0,0 +1,29 @@
+name: Daily Build Silverblue Image
+
+on:
+  schedule:
+    - cron: '0 0 * * *'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+
+      - name: Login to Gitea registry
+        uses: docker/login-action@v2
+        with:
+          username: ${{ secrets.GITEA_USERNAME }}
+          password: ${{ secrets.GITEA_PASSWORD }}
+
+      - name: Build Image
+        run: |
+          docker build -t git.joshua-se.com/joshuase96/silverblue-custom:latest .
+
+      - name: Push Image
+        run: |
+          docker push git.joshua-se.com/joshuase96/silverblue-custom:latest