Update gorilla to 1.5.2, update go to 1.22.3, and add github action to build and test on each PR

[barakplasma]

building off of #430

also adds a github action to make sure the makefile builds binaries successfully before allowing a PR to be merged. also tests the binaries by connecting to the example bash script for dump env and making sure it sends an eof at the end
added an example in https://github.com/barakplasma/websocketd/actions/runs/9455903924

easier than using the makefile is to use go-releaser like I'm doing in my fork (generated by the github action workflow at https://github.com/barakplasma/websocketd/blob/master/.github/workflows/release.yml )
I built binaries for all platforms on the latest golang in
https://github.com/barakplasma/websocketd/releases/tag/0.4.2

[joewalnes]

Closing as superseded — everything valuable here has landed via a different path since this was opened:

• gorilla/websocket is now at v1.5.3 (past the 1.5.2 this targets)
• Go minimum is now 1.21, with CI on 4 platforms (.github/workflows/test.yml) replacing the need for the proposed build-and-test workflow
• The main.go redirect-handler bug this PR fixes (unguarded strings.IndexByte(r.Host, ':') when the host has no port) was independently caught and fixed the same way

Thanks for the contribution — the CI and go-releaser ideas were useful references even though the PR itself doesn't apply cleanly anymore.

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