On the last release, the job succeeded despite no being able to create
the compat PR. This fixes:
- The curl call to actually return non-0 on non-2xx HTTP response.
- The way in which we encode the credentials.
This also attempts to create a Bash library, hopefully this time in a
way that doesn't get destroyed by our release process. IIUC pipeline
instructions (YAML files) are all parsed and read before any execution,
so by embedding the Bash library in a template we should get the correct
version (i.e. the one that is running the pipeline) even when checking
out other commits.
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