Fix: [AEA-0000] - add workflow dependabot (#5)

## Summary

- Routine Change

### Details

- add workflow dependabot workflows

Author: anthony-nhs

.github/workflows/combine-dependabot-prs.yml

@@ -0,0 +1,67 @@
+name: "Combine PRs"
+
+on:
+    workflow_call:
+        inputs:
+            branchPrefix:
+                description: "Branch prefix to find combinable PRs based on"
+                default: "dependabot"
+                type: string
+            mustBeGreen:
+                description: "Only combine PRs that are green (status is success)"
+                default: true
+                type: boolean
+            combineBranchName:
+                description: "Name of the branch to combine PRs into"
+                default: "combine-dependabot-PRs"
+                type: string
+            ignoreLabel:
+                description: "Exclude PRs with this label"
+                default: "nocombine"
+                type: string
+
+    # Allow manual triggering of the workflow for this repo
+    workflow_dispatch:
+        inputs:
+            branchPrefix:
+                description: "Branch prefix to find combinable PRs based on"
+                default: "dependabot"
+                type: string
+            mustBeGreen:
+                description: "Only combine PRs that are green (status is success)"
+                default: true
+                type: boolean
+            combineBranchName:
+                description: "Name of the branch to combine PRs into"
+                default: "combine-dependabot-PRs"
+                type: string
+            ignoreLabel:
+                description: "Exclude PRs with this label"
+                default: "nocombine"
+                type: string
+
+jobs:
+    combine-prs:
+        runs-on: ubuntu-22.04
+        steps:
+            - name: Checkout repository
+              uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8
+              with:
+                  repository: NHSDigital/eps-workflow-dependabot
+                  sparse-checkout-cone-mode: false
+                  sparse-checkout: |
+                      combine-prs.js
+
+            - name: Create Combined PR
+              uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd
+              id: create-combined-pr
+              env:
+                  branchPrefix: ${{ inputs.branchPrefix }}
+                  mustBeGreen: ${{ inputs.mustBeGreen }}
+                  combineBranchName: ${{ inputs.combineBranchName }}
+                  ignoreLabel: ${{ inputs.ignoreLabel }}
+              with:
+                  github-token: ${{secrets.GITHUB_TOKEN}}
+                  script: |
+                      const combinePRs = require('./combine-prs.js');
+                      await combinePRs({ github, context, core });

.github/workflows/dependabot-auto-approve-and-merge.yml

@@ -0,0 +1,61 @@
+name: Dependabot auto-approve
+
+on:
+    workflow_call:
+        secrets:
+            AUTOMERGE_APP_ID:
+                required: true
+            AUTOMERGE_PEM:
+                required: true
+
+permissions:
+    pull-requests: write
+    contents: write
+
+jobs:
+    dependabot:
+        runs-on: ubuntu-22.04
+        if: ${{ github.actor == 'dependabot[bot]' }}
+        steps:
+            - name: Get token from Github App
+              id: get_app_token
+              uses: actions/create-github-app-token@67018539274d69449ef7c02e8e71183d1719ab42
+              with:
+                  app-id: ${{ secrets.AUTOMERGE_APP_ID }}
+                  private-key: ${{ secrets.AUTOMERGE_PEM }}
+
+            - name: Dependabot metadata
+              id: dependabot-metadata
+              uses: dependabot/fetch-metadata@08eff52bf64351f401fb50d4972fa95b9f2c2d1b
+              with:
+                  github-token: "${{ secrets.GITHUB_TOKEN }}"
+
+            - name: Approve patch and minor updates
+              if: ${{steps.dependabot-metadata.outputs.update-type == 'version-update:semver-patch' || steps.dependabot-metadata.outputs.update-type == 'version-update:semver-minor'}}
+              run: gh pr review "$PR_URL" --approve -b "I'm **approving** this pull request because **it includes a patch or minor update**"
+              env:
+                  PR_URL: ${{github.event.pull_request.html_url}}
+                  GITHUB_TOKEN: ${{ steps.get_app_token.outputs.token }}
+
+            - name: Approve major updates of development dependencies
+              if: ${{steps.dependabot-metadata.outputs.update-type == 'version-update:semver-major' && steps.dependabot-metadata.outputs.dependency-type == 'direct:development'}}
+              run: gh pr review "$PR_URL" --approve -b "I'm **approving** this pull request because **it includes a major update of a dependency used only in development**"
+              env:
+                  PR_URL: ${{github.event.pull_request.html_url}}
+                  GITHUB_TOKEN: ${{ steps.get_app_token.outputs.token }}
+
+            - name: Comment on major updates of non-development dependencies
+              if: ${{steps.dependabot-metadata.outputs.update-type == 'version-update:semver-major' && steps.dependabot-metadata.outputs.dependency-type == 'direct:production'}}
+              run: |
+                  gh pr comment "$PR_URL" --body "I'm **not approving** this PR because **it includes a major update of a dependency used in production**"
+                  gh pr edit "$PR_URL" --add-label "requires-manual-qa"
+              env:
+                  PR_URL: ${{github.event.pull_request.html_url}}
+                  GITHUB_TOKEN: ${{ steps.get_app_token.outputs.token }}
+
+            # enable auto merge on all dependabot prs
+            - name: Enable auto-merge for Dependabot PRs
+              run: gh pr merge --auto --squash "$PR_URL"
+              env:
+                  PR_URL: ${{github.event.pull_request.html_url}}
+                  GITHUB_TOKEN: ${{ steps.get_app_token.outputs.token }}

.github/workflows/pull_request.yml

@@ -10,7 +10,7 @@ env:
 jobs:
   dependabot-auto-approve-and-merge:
     needs: quality_checks
-    uses: NHSDigital/eps-workflow-dependabot/.github/workflows/dependabot-auto-approve-and-merge.yml@4b56ed8edd7c5357fd0123a2bd84b3429d3a6b20
+    uses: ./.github/workflows/dependabot-auto-approve-and-merge.yml
     secrets:
       AUTOMERGE_APP_ID: ${{ secrets.AUTOMERGE_APP_ID }}
       AUTOMERGE_PEM: ${{ secrets.AUTOMERGE_PEM }}