CI: Fix patch-em-all: Purge destination dirs if possible

[why]
The purged (obsolete) files are still existing after release.

[how]
We restore the deleted files before it adds the new ones.
Just delete all font files and then download all the release files (all
newly created fonts).

`git add` on a directory will remove all missing files.

Signed-off-by: Fini Jastrow <ulf.fini.jastrow@desy.de>

.github/workflows/release.yml

@@ -211,6 +211,11 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
+      - name: Prepare repo (clear out old and obsolete fonts)
+        run: |
+          cd -- "$GITHUB_WORKSPACE/patched-fonts"
+          find . -name "*.[to]tf" -exec rm {} \;
+
       - name: Download patched fonts from build
         id: download-patched-fonts
         uses: actions/download-artifact@v2
@@ -218,9 +223,9 @@ jobs:
           name: patched-fonts
           path: .
 
-      - uses: EndBug/add-and-commit@v7
+      - uses: EndBug/add-and-commit@v9
         with:
           add: 'patched-fonts'
           message: Rebuilds patched fonts
           committer_name: GitHub Actions
-          committer_email: 41898282+github-actions[bot]@users.noreply.github.com
+          committer_email: 41898282+github-actions[bot]@users.noreply.github.com