Add build step

.github/workflows/cd.yml

@@ -0,0 +1,30 @@
+name: CD
+on:
+  push:
+    branches:
+      - "master"
+      - "cicd"
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  build:
+    runs-on: ubuntu-20.04
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: docker/login-action@v1 
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Skaffold Docker build
+        uses: hiberbee/github-action-skaffold@1.15.0
+        with:
+          command: build
+          repository: ${{ env.REGISTRY }}/txpipe
+          tag: ${{ github.sha }}
+