From bfd771429e0babceb36c02094f5ef30eefddd9d5 Mon Sep 17 00:00:00 2001
From: Sean Rankine <sean.rankine@me.com>
Date: Tue, 8 Aug 2023 15:33:30 +0100
Subject: [PATCH] Add Release workflow to version deployments

This adds a release workflow that creates a new GitHub Release (and git
tag) with an incremental version number. This version tag is then used
to tag images and referenced in the rest of the deployment system. This
makes it easier to compare references (vs commit SHAs). The version tag
is calculated as the last version incremented by the number of merge
commits until the reference commit.
---
 .github/workflows/deploy.yml  | 10 ++++------
 .github/workflows/release.yml | 16 ++++++++++++++++
 2 files changed, 20 insertions(+), 6 deletions(-)
 create mode 100644 .github/workflows/release.yml

diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index 5ab081be..9a0ba4a4 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -19,18 +19,16 @@ on:
         - staging
         - production
         default: 'integration'
-  workflow_run:
-    workflows: [CI]
-    types: [completed]
-    branches: [main]
+  release:
+    types: [released]
 
 jobs:
   build-and-publish-image:
-    if: github.event_name == 'workflow_dispatch' || github.event.workflow_run.conclusion == 'success'
+    if: github.event_name == 'workflow_dispatch' || startsWith(github.ref_name, 'v')
     name: Build and publish image
     uses: alphagov/govuk-infrastructure/.github/workflows/build-and-push-image.yml@main
     with:
-      gitRef: ${{ inputs.gitRef || github.ref }}
+      gitRef: ${{ inputs.gitRef || github.ref_name }}
     secrets:
       AWS_ACCESS_KEY_ID: ${{ secrets.AWS_GOVUK_ECR_ACCESS_KEY_ID }}
       AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_GOVUK_ECR_SECRET_ACCESS_KEY }}
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
new file mode 100644
index 00000000..2a474507
--- /dev/null
+++ b/.github/workflows/release.yml
@@ -0,0 +1,16 @@
+name: Release
+
+on:
+  workflow_dispatch:
+  workflow_run:
+    workflows: [CI]
+    types: [completed]
+    branches: [main]
+
+jobs:
+  release:
+    if: github.event_name == 'workflow_dispatch' || github.event.workflow_run.conclusion == 'success'
+    name: Release
+    uses: alphagov/govuk-infrastructure/.github/workflows/release.yml@main
+    secrets:
+      GH_TOKEN: ${{ secrets.GOVUK_CI_GITHUB_API_TOKEN }}