Update workflow to only generate docs if necessary

Author: slarse

.github/workflows/update-generated-docs.yml

@@ -12,19 +12,37 @@ jobs:
     environment: Docs generation
     permissions:
       contents: write
+    env:
+      CURRENT_DOCS_VERSION: release/0.20.0
     steps:
       - uses: actions/checkout@v4
         with:
           ref: main
 
       - run: |
-         sudo apt-get update
-         sudo apt-get install -y libdbus-1-dev pkg-config
+          git clone https://github.com/gitbutlerapp/gitbutler ../gitbutler
 
-      - run: git clone --depth=1 https://github.com/gitbutlerapp/gitbutler ../gitbutler
-      - run: ./scripts/update-manpages.sh
+      - id: versions
+        run: |
+          LATEST_RELEASE=$(git -C ../gitbutler tag --sort=-version:refname | grep '^release/' | head -n 1)
+
+          echo "latest_release=$LATEST_RELEASE" >> "$GITHUB_OUTPUT"
+
+          if [ "$LATEST_RELEASE" != "$CURRENT_DOCS_VERSION" ]; then
+            echo "should_update=true" >> "$GITHUB_OUTPUT"
+          else
+            echo "should_update=false" >> "$GITHUB_OUTPUT"
+          fi
+
+      - if: steps.versions.outputs.should_update == 'true'
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y libdbus-1-dev libglib2.0-dev pkg-config
+
+          ./scripts/update-manpages.sh
+
+          sed -i "s|CURRENT_DOCS_VERSION: .*|CURRENT_DOCS_VERSION: ${{ steps.versions.outputs.latest_release }}|" .github/workflows/update-generated-docs.yml
 
-      - run: |
           git config user.name "github-actions[bot]"
           git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
 
@@ -36,7 +54,8 @@ jobs:
 
           echo "branch=$branch" >> "$GITHUB_ENV"
 
-      - run: |
+      - if: steps.versions.outputs.should_update == 'true'
+        run: |
           gh pr create \
             --title "Update generated CLI documentation" \
             --body "Created by CI" \