Put latest docs version outside workflow

Author: slarse

.github/workflows/current_docs_version.txt

@@ -0,0 +1 @@
+nightly/0.5.2078

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

@@ -12,8 +12,6 @@ jobs:
     environment: Docs generation
     permissions:
       contents: write
-    env:
-      CURRENT_DOCS_VERSION: nightly/0.5.2077
     steps:
       - uses: actions/checkout@v4
         with:
@@ -25,31 +23,34 @@ jobs:
       - name: Compare versions
         id: versions
         run: |
-          LATEST_RELEASE=$(git -C ../gitbutler tag --sort=-version:refname | grep '^nightly/' | head -n 1)
+          CURRENT_DOCS_VERSION=$(cat .github/workflows/current_docs_version.txt)
+          LATEST_VERSION=$(git -C ../gitbutler tag --sort=-version:refname | grep '^nightly/' | head -n 1)
 
-          echo "latest_release=$LATEST_RELEASE" >> "$GITHUB_OUTPUT"
+          echo "latest_version=$LATEST_VERSION" >> "$GITHUB_OUTPUT"
 
-          if [ "$LATEST_RELEASE" != "$CURRENT_DOCS_VERSION" ]; then
+          if [ "$LATEST_VERSION" != "$CURRENT_DOCS_VERSION" ]; then
             echo "should_update=true" >> "$GITHUB_OUTPUT"
           else
             echo "should_update=false" >> "$GITHUB_OUTPUT"
           fi
 
       - name: Update generated docs
         if: steps.versions.outputs.should_update == 'true'
+        env:
+          LATEST_VERSION=${{ steps.versions.outputs.latest_version }}
         run: |
           sudo apt-get update
           sudo apt-get install -y libdbus-1-dev libglib2.0-dev pkg-config
 
-          git -C ../gitbutler checkout "${{ steps.versions.outputs.latest_release }}"
+          git -C ../gitbutler checkout "$LATEST_VERSION"
           ./scripts/update-manpages.sh
 
-          sed -i "s|CURRENT_DOCS_VERSION: .*|CURRENT_DOCS_VERSION: ${{ steps.versions.outputs.latest_release }}|" .github/workflows/update-generated-docs.yml
+          sed -i "s|CURRENT_DOCS_VERSION: .*|CURRENT_DOCS_VERSION: $LATEST_VERSION|" .github/workflows/update-generated-docs.yml
 
           git config user.name "github-actions[bot]"
           git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
 
-          branch="test-generated-docs-${{ github.run_id }}"
+          branch="update-generated-docs-$LATEST_VERSION"
           git checkout -b "$branch"
           git add .
           git commit -m "Update CLI docs"