fix (demo): Install sharkdp/bat & stop if docs/use demo scripts fail (#…

…137)

.github/workflows/ci.yaml

@@ -28,6 +28,15 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
+        # https://github.com/awalsh128/cache-apt-pkgs-action
+      - uses: awalsh128/cache-apt-pkgs-action@v1.3.0
+        with:
+          # https://github.com/sharkdp/bat (used in some docs/use/**/script)
+          packages: bat
+          # Increase version every time packages change!
+          version: 1.0
+        # https://github.com/sharkdp/bat/issues/982
+      - run: sudo ln -s /usr/bin/batcat /usr/local/bin/bat
       - uses: actions/cache@v3
         with:
           # https://github.com/actions/cache/pull/575/files

test.bash

@@ -33,7 +33,8 @@ echo $ b build //...
 bazelisk build //...
 
 # TODO Replace with docs/use/**/BUILD files, so that demo tests only run if inputs change
-find docs/use -maxdepth 1 -not -path docs/use -type d -exec tools/demo/test.bash {} \;
+# Note use of xargs instead of find -exec \; for error handling, see https://apple.stackexchange.com/a/49047
+find docs/use -maxdepth 1 -not -path docs/use -type d -print0 | xargs -n 1 -0 tools/demo/test.bash
 
 # Check if https://pre-commit.com is available (and try to install it not)
 if ! [ -e "./.venv/bin/pre-commit" ]; then