release workflow (#6)

* wip - publish release

* release yaml

Author: yuval-k

.github/workflows/release.yaml

@@ -0,0 +1,99 @@
+# Copyright 2026 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: release
+
+on:
+  workflow_dispatch:
+    inputs:
+      tag:
+        description: 'Image tag (e.g. v1.2.3-rc1). Leave blank to auto-generate from branch+SHA.'
+        required: false
+      create_release:
+        description: 'Create a GitHub release'
+        type: boolean
+        default: false
+
+permissions:
+  contents: write
+  packages: write
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Validate and resolve tag
+        id: tag
+        run: |
+          TAG="${{ inputs.tag }}"
+          if [[ -z "${TAG}" ]]; then
+            BRANCH="${GITHUB_REF_NAME//\//-}"
+            SHA="$(git rev-parse --short HEAD)"
+            TAG="${BRANCH}-${SHA}"
+          fi
+          if [[ "${{ inputs.create_release }}" == "true" ]]; then
+            if [[ ! "${TAG}" =~ ^v[0-9]+\.[0-9]+\.[0-9]+(-[a-zA-Z0-9._-]+)?$ ]]; then
+              echo "::error::Tag '${TAG}' must match vMAJOR.MINOR.PATCH[-prerelease] when creating a release (e.g. v1.2.3 or v1.2.3-rc1)"
+              exit 1
+            fi
+          fi
+          echo "value=${TAG}" >> "$GITHUB_OUTPUT"
+          if [[ "${{ inputs.create_release }}" == "true" ]]; then
+            echo "tags=${TAG},latest" >> "$GITHUB_OUTPUT"
+          else
+            echo "tags=${TAG}" >> "$GITHUB_OUTPUT"
+          fi
+
+      - name: Setup Go
+        uses: actions/setup-go@v5
+        with:
+          go-version-file: 'go.mod'
+
+      - name: Install ko
+        uses: ko-build/setup-ko@v0.7
+
+      - name: Log in to GHCR
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Set up QEMU (multi-arch)
+        uses: docker/setup-qemu-action@v3
+
+      - name: Build and push images
+        env:
+          # ghcr.io/<owner>/<repo> — resolves correctly in forks
+          KO_DOCKER_REPO: ghcr.io/${{ github.repository }}
+        run: |
+          ./hack/run-tool.sh ko build \
+            --tags "${{ steps.tag.outputs.tags }}" \
+            --platform linux/amd64,linux/arm64 \
+            --bare \
+            ./cmd/ateapi \
+            ./cmd/atelet \
+            ./cmd/podcertcontroller \
+            ./cmd/atenet
+
+      - name: Create GitHub Release
+        if: inputs.create_release
+        uses: softprops/action-gh-release@v2
+        with:
+          tag_name: ${{ steps.tag.outputs.value }}
+          generate_release_notes: true