Linting for shell and GitHub Actions

[jwallwork23]

More linting!

Adds linting for shell and GitHub Actions workflows:

• https://github.com/koalaman/shellcheck
• https://woodruffw.github.io/zizmor

Also fixes an oversight in the CMake linting setup.

[jwallwork23]

My initial push at commit e128fe3 shows the static analysis workflow failing because I'd only applied lint fixes to the static_analysis.yml. With my second push at commit 5858a6b it passes.

[jwallwork23]

#207 has been merged into the branch here so should be merged first.

[jatkinson1000]

They seem active projects.
I note zizmor is in beta, so perhaps we want to pin the version similar to fortitude, to avoid unexpected complaints.

We also need the docs updating to detail these, and I note that shellcheck is not pip installable. Seems installable via all sensible package managers. I wouldn't know where to start with Windows packaga managers, but don't see this as an issue as our docs state "follow the instructions in the linter docs".

[jwallwork23]

They seem active projects. I note zizmor is in beta, so perhaps we want to pin the version similar to fortitude, to avoid unexpected complaints.

We also need the docs updating to detail these, and I note that shellcheck is not pip installable. Seems installable via all sensible package managers. I wouldn't know where to start with Windows packaga managers, but don't see this as an issue as our docs state "follow the instructions in the linter docs".

Thanks @jatkinson1000. Addressed in 2834064.

[jatkinson1000]

Thanks @jwallwork23 All LGTM now!