Improvements to the integration tests framework

[mozzieongit]

• Fix default shell in composite actions (for GitHub)
• Fix inputs to composite action (was unnecessarily set to required, but is optional and needed a default)
• Introduce a build profile environment variable (defaults to debug, can be overridden per job—theoretically even per step, but I think act has a bug there)
• Add installed binaries (cascade{,d}/dnst) to PATH for easier use

Planned:

• Introduce a settings script source file that can be used to fetch config file options/locations.
• Document the default paths for stuff (Cascade, config, state, ...)
• Disable release build until it is actually used by a test

Consider:

• Replace bind9 with NSD serving .test and provide a script to update the DS RR for example.test? (I had used bind9 for it's DNS UPDATE capability)
• Use a custom Docker image based on the slimmed down act image?
• Check that error output from composite actions is visible when running the main workflow
• Provide more errors in the test env management script when components fail (so lots of || { echo "bla"; exit 11; }; to make spotting failing components easier)
• Maybe not try uploading /dev/null, but a file that is supported to avoid the warning ENTRYNOTSUPPORTED

[mozzieongit]

• Fix default shell in composite actions (for GitHub)

This doesn't fix it actually, the defaults.run.shell option doesn't exist for composite actions. Instead I'll have to add the shell to each and every step

[ximon18]

Suggestion: don't tar the entire target directory, it's huge, only built binaries are actually wanted if I understand correctly.

[mozzieongit]

Suggestion: don't tar the entire target directory, it's huge, only built binaries are actually wanted if I understand correctly.

Good idea