build: cronjob cannot install angular snapshot builds

Apparently the script that also ran on TravisCI does not work on MacOS, nor on CircleCI because it's not guaranteed that the default awk supports storing match() results in an array that can print individual match groups.

Author: devversion

scripts/install-angular-snapshots.sh

@@ -8,5 +8,9 @@ set -e
 # Go to the project root directory
 cd $(dirname $0)/../
 
-yarn add \
-  $(awk 'match($0, "@angular/(.*)\":", m){print "github:angular/"m[1]"-builds"}' package.json)
+# Searches for all Angular dependencies in the "package.json" and computes the URL to the github
+# snapshot builds for each Angular package. Afterwards it runs `yarn add --force {urls}` in order
+# to install the snapshot builds for each package. Note that we need to use `--force` because
+# otherwise Yarn will error due to already specified dependencies.
+egrep -o '@angular/[^"]+' ./package.json | sed 's/@/github:/' | sed 's/.*/&-builds/' |
+  xargs yarn add --force