adds reusable work flow on dev for generating config map

.github/workflows/dev-build-cm-reusable-workflow.yaml

@@ -0,0 +1,153 @@
+name: Dev Build and Deploy Config Maps (Reusable)
+
+on:
+  workflow_call:
+    inputs:
+      app-name:
+        description: 'Human-readable name for commit messages'
+        required: true
+        type: string
+      configmap_file:
+        description: 'Repo-relative path to the ConfigMap manifest'
+        type: string
+        required: true
+      configmap_name:
+        description: 'Name of the Config map'
+        type: string
+        required: true  
+      data_key:
+        description: 'The key under which the file content appears in ConfigMap .data.'
+        type: string
+        required: true         
+      namespace:
+        description: 'Kubernetes namespace. Defaults to the apps  if omitted.'
+        type: string
+        required: true       
+      gitops-repo:
+        required: false
+        type: string
+        default: 'isisbusapps/gitops'
+      runner_label:
+        description: 'Self-hosted runner label to target e.g. self-hosted or k8s-prod-runner)'
+        type: string
+        required: false
+        default: 'self-hosted' 
+    secrets:
+      workflow-token:
+        description: 'PAT with repo+workflow scope for the GitOps repo'
+        required: true
+
+  outputs:
+    configmap_output_name:
+      description: 'Name of the ConfigMap that was created/updated'
+      value: ${{ jobs.generate-configmap.outputs.configmap_name }}
+    data_key_used:       
+      description: 'The .data key the file was stored under'
+      value: ${{ jobs.generate-configmap.outputs.data_key_used }}     
+
+jobs:
+  generate-configmap::
+    name: Generate & Commit ConfigMap
+    runs-on: ${{ inputs.runner_label }}
+
+    timeout-minutes: 30
+
+    permissions:
+      packages: write
+
+    configmap_name: ${{ steps.resolve.outputs.configmap_name }}
+
+    steps:
+      - name: Checkout source repository
+        uses: actions/checkout@v6
+
+      - name: Validate source file
+        run: |
+          FILE="${{ inputs.configmap_file }}"
+
+          if [[ ! -f "${FILE}" ]]; then
+            echo "::error file=${FILE}::Source file not found: ${FILE}"
+            exit 1
+          fi
+
+          # Basic sanity — reject empty files
+          if [[ ! -s "${FILE}" ]]; then
+            echo "::error file=${FILE}::Source file is empty: ${FILE}"
+            exit 1
+          fi 
+          echo "Source file found: ${FILE} ($(wc -l < "${FILE}") lines)" 
+
+      - name: Resolve parameters
+        id: resolve
+        run: |
+          # Namespace
+          if [[ -n "${{ inputs.namespace }}" ]]; then
+            NS="${{ inputs.namespace }}"
+          else
+            echo "::error::The namespace input cannot be empty!"
+            exit 1
+          fi
+
+          # Data key
+          if [[ -n "${{ inputs.data_key }}" ]]; then
+            KEY="${{ inputs.data_key }}"
+          else
+            echo "::error::The data key input cannot be empty!"
+            exit 1
+          fi
+
+          # Config Map
+          if [[ -n "${{ inputs.configmap_name }}" ]]; then
+            CM="${{ inputs.configmap_name }}"
+          else
+            echo "::error::The configmap name cannot be empty!"
+            exit 1
+          fi       
+
+          echo "namespace=${NS}"       >> "$GITHUB_OUTPUT"
+          echo "data_key=${KEY}"       >> "$GITHUB_OUTPUT"
+          echo "configmap_name=${CM}"  >> "$GITHUB_OUTPUT"
+
+          echo "ConfigMap name : ${CM}"
+          echo "Namespace      : ${NS}"
+          echo "Data key       : ${KEY}" 
+
+      - name: Generate ConfigMap manifest
+        id: generate
+        run: |
+          NS="${{ steps.resolve.outputs.namespace }}"
+          CM="${{ steps.resolve.outputs.configmap_name }}"
+          KEY="${{ steps.resolve.outputs.data_key }}"
+          FILE="${{ inputs.yaml_file }}"
+
+          echo "Generating ConfigMap manifest..."
+
+          kubectl create configmap "${CM}" \
+            --from-file="${KEY}=${FILE}" \
+            --namespace "${NS}" \
+            --dry-run=client \
+            -o yaml > /tmp/configmap-generated.yaml
+
+          echo "============= Generated manifest==================="
+          cat /tmp/configmap-generated.yaml
+          echo "===================================================" 
+
+  update_gitops:
+    name: Update GitOps Repository
+    runs-on: self-hosted
+    timeout-minutes: 10
+    needs: build_and_push
+    if: github.event_name == 'push' || github.event_name == 'workflow_dispatch'
+    steps:
+      - name: Checkout GitOps repository
+        uses: actions/checkout@v6
+        with:
+          repository: ${{ inputs.gitops-repo }}
+          token: ${{ secrets.workflow-token }}
+
+      - name: Commit and push changes
+        run: |
+          git config --local user.email "action@github.com"
+          git config --local user.name "GitHub Action"
+          git commit -am "[CD] Update ${{ inputs.app-name }} with this commit ${{ github.event.head_commit.url }}"
+          git push