Use KO for building and pushing images

This uses the ko tool to build and push images to ghcr.io.

Building with docker was crashing when compiling and is much slower than ko.

Signed-off-by: Chmouel Boudjnah <[email protected]>

Author: chmouel

.github/workflows/container.yaml

@@ -0,0 +1,50 @@
+name: Create and publish a Docker image to ghcr on main and nightly with ko
+
+on:
+  push:
+    paths:
+      - "**.go"
+      - "**.yaml"
+  pull_request:
+    paths:
+      - "**.go"
+      - "**.yaml"
+env:
+  PLATFORMS: linux/amd64,linux/arm64,linux/ppc64le
+
+jobs:
+  build-and-push-image:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    concurrency:
+      group: ${{ github.workflow }}-${{ github.ref }}
+      cancel-in-progress: true
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version-file: "go.mod"
+
+      - uses: ko-build/[email protected]
+
+      - name: Build and push images
+        shell: bash
+        run: |
+          set -x
+          releaseBranchFormat='release-v'
+          if [[ ${{ github.ref_name }} == ${releaseBranchFormat}* ]]; then
+            tag="${${{ github.ref_name }}#*-}" 
+          else
+            tag=$(echo ${{ github.ref_name }}|sed 's,/merge,,')
+          fi
+
+          for image in ./cmd/*;do
+            ko build -B -t "${tag}" --platform="${{ env.PLATFORMS }}" "${image}"
+          done