feat: added CI pipeline build and push

Author: evmar99

.github/workflows/ci.yaml

@@ -0,0 +1,26 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - "*"
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      - name: Login to DockerHub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Build and push
+        if: github.ref == 'refs/heads/main'
+        uses: docker/build-push-action@v3
+        with:
+          push: true
+          tags: ${{ secrets.DOCKERHUB_USERNAME }}/task-manager:${{ github.sha }}