ci: add build workflows

.github/workflows/build-image.yaml

@@ -0,0 +1,31 @@
+name: Image (Build)
+
+on: [push]
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: |
+            rornic/starling-exporter
+          tags: |
+            type=sha           
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Build
+        uses: docker/build-push-action@v5
+        with:
+          push: false
+          context: .
+          tags: ${{ steps.meta.outputs.tags }}

.github/workflows/go.yaml

@@ -0,0 +1,23 @@
+name: Go
+
+on: [push]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: '1.22.x'
+
+      - name: Install dependencies
+        run: go get .
+
+      - name: Build
+        run: go build -v ./...
+
+      - name: Test
+        run: go test