[asulwer]

Closes #21

PRs that only touch docs, the README, the license, the release workflow or Dependabot's settings no longer wait for the build checks.

How it works

• A new first job, Needs a build?, lists the PR's changed files with gh pr diff --name-only. It takes a few seconds.
• Tests and Android Release build now depend on that job. They run only if a changed file is something the app or tests are built from:
  • CallGuard*/, *.slnx, Directory.Packages.props, global.json, dotnet-tools.json
  • this workflow itself, so changes to it get tried out
• Otherwise both jobs are skipped. GitHub counts a skipped job as passed for required checks, so branch protection still works and the PR can be merged right away.
• The workflow still runs on every PR. Filtering the whole workflow by path (paths-ignore) doesn't work with required checks: they would wait forever.
• Run workflow (manual run) always builds.

This PR changes build-test.yml itself, so it does run the full build this one time.

BUILD.md's Continuous integration section is updated.

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