ci: merge workflow_dispatch input (#2206)

Author: DerekRoberts

.github/workflows/merge.yml

@@ -10,10 +10,10 @@ on:
       - '!.github/workflows/**'
   workflow_dispatch:
     inputs:
-      pr_no:
-        description: "PR-numbered container set to deploy"
-        type: number
-        required: true
+      tag:
+        description: "Tag set to deploy; e.g. PR number, latest or prod (default)"
+        type: string
+        default: 'prod'
 
 concurrency:
   # Do not interrupt previous workflows
@@ -24,15 +24,25 @@ jobs:
   vars:
     name: Set Variables
     outputs:
-      pr: ${{ steps.pr.outputs.pr }}
+      tag: ${{ steps.tag.outputs.tag }}
     runs-on: ubuntu-24.04
     timeout-minutes: 1
     steps:
       # Get PR number for squash merges to main
       - name: PR Number
+        if: ${{ ! inputs.tag }}
         id: pr
         uses: bcgov-nr/[email protected]
 
+      - name: Set Tag
+        id: tag
+        run: |
+          if [ -z "${{ inputs.pr_no }}" ]; then
+            echo "tag=${{ steps.pr.outputs.pr }}" >> $GITHUB_ENV
+          else
+            echo "tag=${{ inputs.tag }}" >> $GITHUB_ENV
+          fi
+
   # https://github.com/bcgov/quickstart-openshift-helpers
   deploy-test:
     name: Deploy (test)
@@ -43,6 +53,7 @@ jobs:
     with:
       environment: test
       db_user: app
+      tag: ${{ needs.var.outputs.tag }}
 
   deploy-prod:
     name: Deploy (prod)
@@ -60,6 +71,7 @@ jobs:
         --set global.autoscaling=true
         --set frontend.pdb.enabled=true
         --set backend.pdb.enabled=true
+      tag: ${{ needs.var.outputs.tag }}
 
   promote:
     name: Promote Images
@@ -76,5 +88,5 @@ jobs:
         with:
           registry: ghcr.io
           repository: ${{ github.repository }}/${{ matrix.package }}
-          target: ${{ needs.vars.outputs.pr }}
+          target: ${{ needs.var.outputs.tag }}
           tags: prod