Add Github action to generate release (#90)

This PR Adds:

* make targets to generate release artifacts.
* release action.

Author: Mohamed Chiheb Ben Jemaa

.github/workflows/release.yml

@@ -0,0 +1,38 @@
+name: release
+
+on:
+  push:
+    # Sequence of patterns matched against refs/tags
+    tags:
+      - 'v*' # Push events to matching v*, i.e. v1.0, v20.15.10
+
+permissions:
+  contents: write # Allow to create a release.
+
+jobs:
+  build:
+    name: create draft release
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set env
+        run:  echo "RELEASE_TAG=${GITHUB_REF##refs/tags/}" >> "$GITHUB_ENV"
+      - name: checkout code
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 1
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
+      - name: generate release artifacts
+        run: |
+          make release-manifests RELEASE_VERSION=${{ env.RELEASE_TAG }}
+      - name: generate release templates
+        run: |
+          make release-templates
+      - name: Release
+        uses: softprops/action-gh-release@v2
+        with:
+          draft: true
+          files: out/*
+          generate_release_notes: true

.gitignore

@@ -37,3 +37,7 @@ envfile
 
 # test path for local test programs
 /cmd/test/**
+cluster.yaml
+
+# release
+out/

Makefile

@@ -222,3 +222,28 @@ verify-gen: manifests generate ## Verify that the generated files are up to date
 
 .PHONY: verify
 verify: verify-gen verify-tidy ## Run all verifications.
+
+
+##@ Release
+## --------------------------------------
+## Release
+## --------------------------------------
+
+REPOSITORY ?= ghcr.io/ionos-cloud/cluster-api-provider-ionoscloud
+RELEASE_DIR ?= out
+RELEASE_VERSION ?= v0.0.1
+
+.PHONY: release-manifests
+RELEASE_MANIFEST_SOURCE_BASE ?= config/default
+release-manifests: $(KUSTOMIZE) ## Create kustomized release manifest in $RELEASE_DIR (defaults to out).
+	@mkdir -p $(RELEASE_DIR)
+	cp metadata.yaml $(RELEASE_DIR)/metadata.yaml
+	## change the image tag to the release version
+	cd $(RELEASE_MANIFEST_SOURCE_BASE) && $(KUSTOMIZE) edit set image $(REPOSITORY):$(RELEASE_VERSION)
+	## generate the release manifest
+	$(KUSTOMIZE) build $(RELEASE_MANIFEST_SOURCE_BASE) > $(RELEASE_DIR)/infrastructure-components.yaml
+
+.PHONY: release-templates
+release-templates: ## Generate release templates
+	@mkdir -p $(RELEASE_DIR)
+	cp templates/cluster-template*.yaml $(RELEASE_DIR)/