Add GitHub Actions workflows for build and deployment

.gitea/workflows/deploy.yml

@@ -0,0 +1,22 @@
+name: Build
+on:
+  push:
+    tags:
+      - 'v*'
+jobs:
+  build:
+    runs-on: standard-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Login
+        with: # Set the secret as an input
+          package_rw: ${{ secrets.PACKAGE_RW }}
+        run: docker login gitea.seeseepuff.be -u seeseemelk -p ${{ secrets.PACKAGE_RW }}
+
+      - name: Build
+        run: docker build -t gitea.seeseepuff.be/seeseemelk/pcinv:${{github.ref_name}} .
+
+      - name: Push
+        run: docker push gitea.seeseepuff.be/seeseemelk/pcinv:${{github.ref_name}}