build(release): make release candidate

The release action will be used to make rc tags and prereleases that will be eventually promoted.
The rc distributes two attachments:
 - cloudformation.zip containing the cloudformation templates versioned by the prerelease action
 - checksum.txt containing the checksum of the resources attached to the prerelease

The agent-kilt golang executable is no longer distributed. It will be replaced by a docker image.

Signed-off-by: francesco-racciatti <[email protected]>

.github/workflows/release.yml

@@ -1,45 +1,96 @@
-name: Release agent-kilt
+name: prerelease
 
 on:
-  push:
-    tags:
-      - 'v*'
+  workflow_dispatch:
+    inputs:
+      release_version:
+        description: 'The release version, e.g. 5.0.0.'
+        type: string
+        required: true
 
-env:
-  GO_VERSION: 1.21.x
+      rc_number:
+        description: 'The release candidate number, e.g. 1.'
+        type: string
+        required: true
+
+      serverless_agent_version:
+        description: 'The version of the serverless-agent to be referenced by this release, e.g., 4.0.0. It will use the same version as the release if not specified.'
+        type: string
+        required: false
 
 jobs:
   release:
+    env:
+      RC_NAME: ${{ inputs.release_version }}-rc${{ inputs.rc_number }}
     name: Release
     runs-on: ubuntu-latest
     steps:
-      - name: Set up Go
-        uses: actions/setup-go@v4
-        with:
-          go-version: ${{ env.GO_VERSION }}
-        id: go
+      - name: Verify inputs
+        shell: bash
+        run: |
+          if [[ ! "${{ inputs.release_version }}" =~ ^([0-9]+)\.([0-9]+)\.([0-9]+)$ ]]; then
+              echo "The provided release version is not valid"
+              exit 1
+          fi
+
+          if [[ ! "${{ inputs.rc_number }}" =~ ^([0-9])+$ ]]; then
+              echo "The provided rc tag is not valid"
+              exit 1
+          fi
+
+          docker pull "quay.io/sysdig/workload-agent:${{ inputs.serverless_agent_version }}" &> /dev/null
+          exit_code=$?
+          if [[ $exit_code -ne 0 ]]; then
+            echo "The provided serverless_agent_version does not exists."
+            exit 1
+          fi
 
       - name: Checkout Code
         uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
-      - name: Build agent-kilt handler
+      - name: Push RC tag
+        shell: bash
+        run: |
+          git fetch --tags
+          if git rev-parse "${RC_NAME}" &> /dev/null; then
+            echo "The tag ${RC_NAME} already exists"
+            exit 1
+          fi
+          git tag "${RC_NAME}"
+          git push -u origin "${RC_NAME}"
+
+      - name: Prepare dist package
+        shell: bash
+        run: |
+          rm -rf dist
+          mkdir -p dist/provisioning/cloudformation
+
+      - name: Add versioned CloudFormation templates
+        env:
+          RELEASE_VERSION: ${{ inputs.release_version }}
+          SERVERLESS_AGENT_VERSION: ${{ inputs.serverless_agent_version || inputs.release_version }}
+        shell: bash
         run: |
-          make -C runtimes/cloudformation clean cmd/handler/handler
+          script="s/(dev)/${RELEASE_VERSION}/g; s/agent:latest/${SERVERLESS_AGENT_VERSION}/g"
+          sed "$script" provisioning/cloudformation/orchestrator-agent.yaml > dist/provisioning/cloudformation/orchestrator-agent.yaml
+          sed "$script" provisioning/cloudformation/instrumentation.yaml > dist/provisioning/cloudformation/instrumentation.yaml
 
-      - name: Archive build
+      - name: Create prerelease attachments
+        shell: bash
         run: |
-          zip -j agent-kilt.zip runtimes/cloudformation/cmd/handler/handler
-          sha256sum agent-kilt.zip > checksums.txt
+          pushd dist/provisioning; zip -r ../../cloudformation.zip .; popd
+          sha256sum cloudformation.zip > checksums.txt
 
-      - name: Create GitHub Release
-        id: create_release
-        uses: softprops/action-gh-release@v1
+      - name: Create prerelease
+        uses: softprops/action-gh-release@v2
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         with:
           files: |
-            agent-kilt.zip
+            cloudformation.zip
             checksums.txt
-          tag_name: ${{ github.ref }}
+          name: ${RC_NAME}
+          tag_name: ${RC_NAME}
+          prerelease: true