add k8s-cache build image github action (#131)

* add k8s-cache build image github action

* rename k8s cache image

Author: NimrodAvni78

.github/workflows/publish_dockerhub_k8s_cache_main.yml

@@ -0,0 +1,58 @@
+# TODO: trigger only if testing or any other checks previously succeeded
+name: Push k8s cache to DockerHub (main)
+on:
+  push:
+    branches:
+      - main
+
+permissions:
+  contents: read
+  id-token: write
+  packages: write
+
+jobs:
+  build-and-push-image:
+    runs-on: ubuntu-latest
+    env:
+      IMAGE_NAME: opentelemetry-ebpf-k8s-cache
+    steps:
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
+        with:
+          persist-credentials: false
+
+      - name: Log in to Docker Hub
+        uses: docker/login-action@74a5d142397b4f367a81961eba4e8cd7edddf772 # v3.4.0
+        with:
+          username: ${{ vars.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_TOKEN_EBPF_INSTRUMENTATION }}
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@74a5d142397b4f367a81961eba4e8cd7edddf772 # v3.4.0
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@29109295f81e9208d7d86ff1c6c12d2833863392 # v3.6.0
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@b5ca514318bd6ebac0fb2aedd5d36ec1b5c232a2 # v3.10.0
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@902fa8ec7d6ecbf8d84d538b9b233a880e428804 # v5.7.0
+        with:
+          images: |
+            otel/${{ env.IMAGE_NAME }}
+            ghcr.io/${{ github.repository }}/${{ env.IMAGE_NAME }}
+
+      - name: Build and push
+        uses: docker/build-push-action@1dc73863535b631f98b2378be8619f83b136f4a0 # v6.17.0
+        with:
+          context: .
+          file: ./k8scache.Dockerfile
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          platforms: linux/amd64,linux/arm64