docs(testing): document link-checker binary release process

Add comprehensive documentation for maintainers on how to:
- Create releases in docs-tooling (automated)
- Manually distribute binaries to docs-v2 (required for private repo)
- Update workflow references when needed

This addresses the missing process documentation for link-checker
binary distribution between the two repositories.

feat(ci): update link-checker to v1.2.2 and add manual sync workflow

- Update pr-link-check.yml to use link-checker-v1.2.2 with latest fixes
- Add sync-link-checker-binary.yml for manual binary distribution
- Improvements in v1.2.2: base URL detection, anchor validation, JSON parsing

The v1.2.2 release fixes the Hugo base URL detection issue and
improves anchor link validation that was tested in this PR.

.github/workflows/pr-link-check.yml

@@ -95,7 +95,7 @@ jobs:
           curl -L -H "Accept: application/vnd.github+json" \
             -H "Authorization: Bearer ${{ secrets.GITHUB_TOKEN }}" \
             -o link-checker-info.json \
-            "https://api.github.com/repos/influxdata/docs-v2/releases/tags/link-checker-v1.0.0"
+            "https://api.github.com/repos/influxdata/docs-v2/releases/tags/link-checker-v1.2.2"
           
           # Extract download URL for linux binary
           DOWNLOAD_URL=$(jq -r '.assets[] | select(.name | test("link-checker.*linux")) | .url' link-checker-info.json)

.github/workflows/sync-link-checker-binary.yml

@@ -0,0 +1,68 @@
+name: Sync Link Checker Binary from docs-tooling
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'Link checker version to sync (e.g., v1.2.2)'
+        required: true
+        type: string
+
+jobs:
+  sync-binary:
+    name: Sync link-checker binary from docs-tooling
+    runs-on: ubuntu-latest
+    
+    steps:
+      - name: Download binary from docs-tooling release
+        run: |
+          echo "Downloading link-checker ${{ inputs.version }} from docs-tooling..."
+          
+          # Download binary from docs-tooling release
+          curl -L -H "Accept: application/octet-stream" \
+            -H "Authorization: Bearer ${{ secrets.GITHUB_TOKEN }}" \
+            -o link-checker-linux-x86_64 \
+            "https://github.com/influxdata/docs-tooling/releases/download/link-checker-${{ inputs.version }}/link-checker-linux-x86_64"
+          
+          # Download checksums
+          curl -L -H "Accept: application/octet-stream" \
+            -H "Authorization: Bearer ${{ secrets.GITHUB_TOKEN }}" \
+            -o checksums.txt \
+            "https://github.com/influxdata/docs-tooling/releases/download/link-checker-${{ inputs.version }}/checksums.txt"
+          
+          # Verify downloads
+          ls -la link-checker-linux-x86_64 checksums.txt
+          
+      - name: Create docs-v2 release
+        run: |
+          echo "Creating link-checker-${{ inputs.version }} release in docs-v2..."
+          
+          gh release create \
+            --title "Link Checker Binary ${{ inputs.version }}" \
+            --notes "Link validation tooling binary for docs-v2 GitHub Actions workflows.
+
+          This binary is distributed from the docs-tooling repository release link-checker-${{ inputs.version }}.
+
+          ### Usage in GitHub Actions
+
+          The binary is automatically downloaded by docs-v2 workflows for link validation.
+
+          ### Manual Usage
+
+          \`\`\`bash
+          # Download and make executable
+          curl -L -o link-checker https://github.com/influxdata/docs-v2/releases/download/link-checker-${{ inputs.version }}/link-checker-linux-x86_64
+          chmod +x link-checker
+
+          # Verify installation
+          ./link-checker --version
+          \`\`\`
+
+          ### Changes in ${{ inputs.version }}
+
+          See the [docs-tooling release](https://github.com/influxdata/docs-tooling/releases/tag/link-checker-${{ inputs.version }}) for detailed changelog." \
+            link-checker-${{ inputs.version }} \
+            link-checker-linux-x86_64 \
+            checksums.txt
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}

TESTING.md

@@ -171,6 +171,47 @@ cargo build --release
 cp target/release/link-checker /usr/local/bin/
 ```
 
+#### Binary Release Process
+
+**For maintainers:** To create a new link-checker release in docs-v2:
+
+1. **Create release in docs-tooling** (builds and releases binary automatically):
+   ```bash
+   cd docs-tooling
+   git tag link-checker-v1.2.x
+   git push origin link-checker-v1.2.x
+   ```
+
+2. **Manually distribute to docs-v2** (required due to private repository access):
+   ```bash
+   # Download binary from docs-tooling release
+   curl -L -H "Authorization: Bearer $(gh auth token)" \
+     -o link-checker-linux-x86_64 \
+     "https://github.com/influxdata/docs-tooling/releases/download/link-checker-v1.2.x/link-checker-linux-x86_64"
+   
+   curl -L -H "Authorization: Bearer $(gh auth token)" \
+     -o checksums.txt \
+     "https://github.com/influxdata/docs-tooling/releases/download/link-checker-v1.2.x/checksums.txt"
+   
+   # Create docs-v2 release
+   gh release create \
+     --repo influxdata/docs-v2 \
+     --title "Link Checker Binary v1.2.x" \
+     --notes "Link validation tooling binary for docs-v2 GitHub Actions workflows." \
+     link-checker-v1.2.x \
+     link-checker-linux-x86_64 \
+     checksums.txt
+   ```
+
+3. **Update workflow reference** (if needed):
+   ```bash
+   # Update .github/workflows/pr-link-check.yml line 98 to use new version
+   sed -i 's/link-checker-v[0-9.]*/link-checker-v1.2.x/' .github/workflows/pr-link-check.yml
+   ```
+
+> [!Note]
+> The manual distribution is required because docs-tooling is a private repository and the default GitHub token doesn't have cross-repository access for private repos.
+
 #### Core Commands
 
 ```bash