chore: move generate_combined_coverage.sh into scripts

scripts/generate_combined_coverage.sh

@@ -0,0 +1,30 @@
+#!/bin/sh -e
+
+# A script for computing combined coverage for all packages in the repo.
+# This can be used for viewing coverage locally in your editor.
+
+# This generates into ./coverage/lcov.info, which may not be the correct
+# directory if you've opened a single package or a directory above 'shorebird'
+# in your editor.
+
+# Our GitHub actions build coverage and upload it to Codecov, so you
+# don't need to run this script to see coverage on GitHub.
+# https://app.codecov.io/gh/shorebirdtech/shorebird
+
+dart pub global activate coverage
+dart pub global activate combine_coverage
+
+PACKAGES=$(ls -d packages/*)
+echo $PACKAGES
+
+for PACKAGE_DIR in $PACKAGES
+do
+    echo $PACKAGE_DIR
+    cd $PACKAGE_DIR
+    dart pub get
+    dart test --coverage=coverage
+    dart pub global run coverage:format_coverage --lcov --in=coverage --out=coverage/lcov.info --packages=.dart_tool/package_config.json --report-on=lib --check-ignore
+    cd ../..
+done
+
+dart pub global run combine_coverage --repo-path .