Add release workflow for LocalStack

Author: dfangl

.github/workflows/release.yml

@@ -0,0 +1,48 @@
+name: Release LS version of webhook
+
+on:
+  workflow_dispatch:
+    inputs:
+      goVersion:
+        description: 'Go version to build with'
+        required: true
+        type: string
+        default: '1.24.9'
+      tag:
+        description: 'Tag to push'
+        required: true
+        type: string
+jobs:
+  build:
+    # this is to prevent the job to run at forked projects
+    runs-on: ubuntu-latest
+    permissions:
+      id-token: write
+    steps:
+      - uses: actions/checkout@v5
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKERHUB_PUSH_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_PUSH_TOKEN }}
+
+      - name: Build container and push to Dockerhub registry
+        env:
+          TAG: ${{ inputs.tag }}
+          GO_VERSION: ${{ inputs.goVersion }}
+        run: |
+          REPO=localstack/amazon-eks-pod-identity-webhook
+          docker buildx build \
+                -t $REPO:$TAG \
+                --build-arg golang_image=public.ecr.aws/eks-distro-build-tooling/golang:${{ env.GO_VERSION }}-gcc \
+                --platform=linux/amd64,linux/arm64 \
+                --progress plain \
+                --push .
+