Update branch to main and newer OS versions

Update to Ubuntu 22.04 and macOS 12 to fix CI.

Fix `*.ipynb` generation by calling `python` on the CLI rather than having the
script invoke `/usr/bin/python` manually, which no longer exists on macOS
(disappeared sometime after macOS 10.15).

Add `VERBOSE=2` to the `bazel test` command to get more useful output when tests
fail.

.github/workflows/main.yml

@@ -16,15 +16,15 @@ name: "Build & test"
 
 on:
   push:
-    branches: [ master ]
+    branches: [ main ]
   pull_request:
-    branches: [ master ]
+    branches: [ main ]
 
 jobs:
   build:
     strategy:
       matrix:
-        os: [ 'ubuntu-20.04', 'macos-10.15' ]
+        os: [ 'ubuntu-22.04', 'macos-12' ]
 
     name: Running on ${{ matrix.os }}
     runs-on: ${{ matrix.os }}
@@ -45,4 +45,4 @@ jobs:
         run: bazel build --config=ci //...
 
       - name: Run tests
-        run: bazel test --config=ci //...
+        run: bazel test --config=ci --test_env=VERBOSE=2 //...

autogen.sh

@@ -489,7 +489,7 @@ EOF
       ;;
 
     *.ipynb)
-      printLicenseHashComment | $(dirname $0)/ipynb.py
+      printLicenseHashComment | python $(dirname $0)/ipynb.py
       ;;
 
     *.rb)