try using github.ref_name to get tag str

See #573

.github/workflows/CI.yml

@@ -18,10 +18,11 @@ jobs:
 
     steps:
 
-    - name: Set vars
-      id: vars
-      # run: echo ::set-output name=tag::${GITHUB_REF#refs/*/}   # this is depreciated: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/
-      run: echo "name=tag::${GITHUB_REF#refs/*/}" >> $GITHUB_OUTPUT
+    # - name: Set vars
+    #   id: vars
+    #   # run: echo ::set-output name=tag::${GITHUB_REF#refs/*/}   # this is depreciated: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/
+    #   #run: echo "name=tag::${GITHUB_REF#refs/*/}" >> $GITHUB_OUTPUT  # does this not work?
+    #   run: echo "tag=${GITHUB_REF#refs/*/}" >> $GITHUB_OUTPUT
 
     - name: Checkout code
       uses: actions/[email protected]
@@ -151,7 +152,7 @@ jobs:
 
     - name: Deploy Documentation for master
       if: matrix.gcc_v == 7 && github.ref == 'refs/heads/master'
-      uses: JamesIves/github-pages-deploy-action@4.1.3
+      uses: JamesIves/github-pages-deploy-action@v4.6.1
       with:
         branch: gh-pages # The branch the action should deploy to.
         folder: doc  # The folder the action should deploy.
@@ -171,11 +172,11 @@ jobs:
 
     - name: Deploy documentation for tagged release
       if: matrix.gcc_v == 7 && startsWith(github.ref, 'refs/tags/')
-      uses: JamesIves/github-pages-deploy-action@v4.4.1
+      uses: JamesIves/github-pages-deploy-action@v4.6.1
       with:
         branch: gh-pages # The branch the action should deploy to.
         folder: doc  # The folder the action should deploy.
-        target-folder: prev/${{ steps.vars.outputs.tag }} # deploy to a version-specific folder
+        target-folder: prev/${{github.ref_name}} # deploy to a version-specific folder
 
     - name: Upload coverage
       if: matrix.gcc_v == 7