feat: use portainer hook instead of pushing image to gitea package repository

.gitea/workflows/docker-build.yml

@@ -1,4 +1,4 @@
-name: Build and Push Docker Image
+name: Build and Deploy
 
 on:
   push:
@@ -32,14 +32,13 @@ jobs:
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
 
-      - name: Log in to DockerHub
-        uses: docker/login-action@v3
-        with:
-          registry: git.pihkaal.me
-          username: ${{ secrets.REGISTRY_USERNAME }}
-          password: ${{ secrets.REGISTRY_PASSWORD }}
+      - name: Build Docker image
+        run: docker build --build-arg COMMIT_SHA=$(git rev-parse --short HEAD) -f apps/discord-bot/Dockerfile .
 
-      - name: Build and push Docker image
-        run: |
-          docker build --build-arg COMMIT_SHA=$(git rev-parse --short HEAD) -t git.pihkaal.me/pihkaal/lbf-bot:latest -f apps/discord-bot/Dockerfile .
-          docker push git.pihkaal.me/pihkaal/lbf-bot:latest
+  deploy:
+    runs-on: ubuntu-latest
+    needs: build
+
+    steps:
+      - name: Trigger Portainer webhook
+        run: curl -X POST "${{ secrets.PORTAINER_WEBHOOK_URL }}"