The config file checks were returning okay even when there were errors. The yq tool returns "null" when it cannot find what's queried, but exists with a 0 rc still.
- Prefer using a pipe to `while read`
- But use a temp file when the loop needs to modify variables that need to be used outside the loop, as the pipe creates a subshell and modifications do not survive after the loop exits.
The checkout action fetches one single commit, so attempts to find previous states of a page result in error. Adding fetch-depth:0 to the configuration fetches all commits and makes finding the previous commit that changed a page possible in the github action.