CI: add workflow for docker builder image

Signed-off-by: Florian Lehner <[email protected]>

.github/workflows/push-docker-image.yml

@@ -0,0 +1,36 @@
+name: "Update builder docker image"
+
+on:
+  push:
+    branches: ["main"]
+    paths:
+      - "Dockerfile"
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+      - name: Set up environment
+        uses: ./.github/workflows/env
+      - name: Login to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      - name: Set current timestamp tag
+        id: tag
+        run: |
+          echo "tag=$(date +%Y%m%d%H%M)" >> $GITHUB_OUTPUT
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          push: true
+          file: Dockerfile
+          platforms: linux/amd64,linux/arm64
+          tags: otel/opentelemetry-ebpf-profiler-dev:latest,otel/opentelemetry-ebpf-profiler-dev:${{ steps.tag.outputs.tag }}