Add workflow to allow creating image from this branch

.github/workflows/ci_mongo_to_pg.yml

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+name: CI
+
+on:
+  workflow_dispatch: {}
+  push:
+    branches:
+      - publisher-on-postgres-branch
+    paths-ignore:
+      - "Jenkinsfile"
+      - ".git**"
+
+jobs:
+  codeql-sast:
+    name: CodeQL SAST scan
+    uses: alphagov/govuk-infrastructure/.github/workflows/codeql-analysis.yml@main
+    permissions:
+      security-events: write
+
+  dependency-review:
+    name: Dependency Review scan
+    uses: alphagov/govuk-infrastructure/.github/workflows/dependency-review.yml@main
+
+  security-analysis:
+    name: Security Analysis
+    uses: alphagov/govuk-infrastructure/.github/workflows/brakeman.yml@main
+    secrets: inherit
+    permissions:
+      contents: read
+      security-events: write
+      actions: read

.github/workflows/deploy_mongo_to_pg.yml

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+name: Deploy
+
+run-name: Deploy ${{ inputs.gitRef || github.event.release.tag_name  }} to ${{ inputs.environment || 'integration' }}
+
+on:
+  workflow_dispatch:
+    inputs:
+      gitRef:
+        description: 'Commit, tag or branch name to deploy'
+        required: true
+        type: string
+      environment:
+        description: 'Environment to deploy to'
+        required: true
+        type: choice
+        options:
+        - integration
+        default: 'integration'
+      ecrRepositoryName:
+        description: 'ECR repo name to push image to'
+        required: true
+        type: choice
+        options:
+          - publisher-on-postgres-branch
+        default: 'mainstream-on-postgres-branch'
+  release:
+    types: [released]
+
+jobs:
+  build-and-publish-image:
+    if: github.event_name == 'workflow_dispatch' || startsWith(github.event.release.tag_name, 'v')
+    name: Build and publish image
+    uses: alphagov/govuk-infrastructure/.github/workflows/build-and-push-multiarch-image.yml@main
+    with:
+      gitRef: ${{ inputs.gitRef || github.event.release.tag_name }}
+      ecrRepositoryName: ${{ inputs.ecrRepositoryName }}
+    permissions:
+      id-token: write
+      contents: read
+      packages: write
+  trigger-deploy:
+    name: Trigger deploy to ${{ inputs.environment || 'integration' }}
+    needs: build-and-publish-image
+    uses: alphagov/govuk-infrastructure/.github/workflows/deploy.yml@main
+    with:
+      imageTag: ${{ needs.build-and-publish-image.outputs.imageTag }}
+      environment: ${{ inputs.environment || 'integration' }}
+    secrets:
+      WEBHOOK_TOKEN: ${{ secrets.GOVUK_ARGO_EVENTS_WEBHOOK_TOKEN }}
+      WEBHOOK_URL: ${{ secrets.GOVUK_ARGO_EVENTS_WEBHOOK_URL }}
+      GH_TOKEN: ${{ secrets.GOVUK_CI_GITHUB_API_TOKEN }}