add CI to deploy ioc-template-example

.github/workflows/_check.yml

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+on:
+  workflow_call:
+    outputs:
+      branch-pr:
+        description: The PR number if the branch is in one
+        value: ${{ jobs.pr.outputs.branch-pr }}
+
+jobs:
+  pr:
+    runs-on: "ubuntu-latest"
+    outputs:
+      branch-pr: ${{ steps.script.outputs.result }}
+    steps:
+      - uses: actions/github-script@v7
+        id: script
+        if: github.event_name == 'push'
+        with:
+          script: |
+            const prs = await github.rest.pulls.list({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              head: context.repo.owner + ':${{ github.ref_name }}'
+            })
+            if (prs.data.length) {
+              console.log(`::notice ::Skipping CI on branch push as it is already run in PR #${prs.data[0]["number"]}`)
+              return prs.data[0]["number"]
+            }

.github/workflows/_example.yml

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+on:
+  workflow_call:
+    secrets:
+      EXAMPLE_DEPLOY_KEY:
+        required: true
+jobs:
+  update:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          # Need this to get version number from last tag
+          fetch-depth: 0
+
+      - name: Regenerate example
+        run: |
+          pipx run copier copy --data-file example-answers.yml --trust --vcs-ref=HEAD . example
+
+      - name: Rewrite copier answers
+        run: |
+          sed -i 's|_src_path: .|_src_path: gh:epics-containers/ioc-template|' example/.copier-answers.yml
+
+      - name: Publish example
+        # We pin to the SHA, not the tag, for security reasons.
+        # https://docs.github.com/en/actions/learn-github-actions/security-hardening-for-github-actions#using-third-party-actions
+        uses: peaceiris/actions-gh-pages@4f9cc6602d3f66b9c108549d475ec49e8ef4d45e # v4.0.0
+        with:
+          deploy_key: ${{ secrets.EXAMPLE_DEPLOY_KEY }}
+          publish_dir: example
+          external_repository: epics-containers/ioc-template-example
+          publish_branch: main
+          exclude_assets: ''  # default would exclude .github

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  check:
+    uses: ./.github/workflows/_check.yml
+
+  example:
+    needs: check
+    if: github.ref_name == 'main'
+    uses: ./.github/workflows/_example.yml
+    secrets:
+      EXAMPLE_DEPLOY_KEY: ${{ secrets.EXAMPLE_DEPLOY_KEY }}

example-answers.yml

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+# Changes here will be overwritten by Copier; NEVER EDIT MANUALLY
+_commit: 3.5.0
+_src_path: ioc-template
+description: A test instantiation of the ioc-template copier template
+git_platform: github.com
+github_org: epics-containers
+name: ioc-template-example
+repo_uri: [email protected]:epics-containers/ioc-template-example.git
+rtems: false