Make respec timeouts configurable

[arnoweiss]

I am trying to use this action with a respec project that makes heavy use of markdown. The transpilation into static html seems to be quite resource intensive. This causes this action to fail, see logs [1]. I'm quite sure that this because there's a timeout of 20 seconds hardcoded in this action [2].

My feature request thus is to introduce a new configuration parameter RESPEC_TIMEOUT that defaults to 20 and can be set in each workflow.

[1]

Generate Static HTML
  [INFO] Build respec document "index.html" (common)…
    $ respec -s "http://localhost:3000/index.html" -o "index.html.built.html" --verbose -t 20 -e
      [INFO] [Timeout: 20000ms] Processing resource: http://localhost:3000/index.html ...
      [INFO] [Timeout: 20000ms] Launching browser
      [INFO] [Timeout: 19203ms] Navigating to http://localhost:3000/index.html
  Error: ROR] undefined
      [INFO] [Timeout: 18884ms] Navigation complete.
      [INFO] [Timeout: 18857ms] Using ReSpec v35.1.1
      [INFO] [Timeout: 18856ms] Processing ReSpec document...
      [FATAL] Error: 
      😭  Sorry, there was an error generating the HTML. Please report this issue!
      Specification: http://localhost:3000/index.html
      ReSpec version: 35.1.1
      File a bug: https://github.com/speced/respec/
      Error: undefined
      
          at generateHTML (file:///home/runner/work/_actions/w3c/spec-prod/v2/node_modules/.pnpm/[email protected][email protected]/node_modules/respec/tools/respecDocWriter.js:233:11)
          at async toHTML (file:///home/runner/work/_actions/w3c/spec-prod/v2/node_modules/.pnpm/[email protected][email protected]/node_modules/respec/tools/respecDocWriter.js:100:18)
          at async run (file:///home/runner/work/_actions/w3c/spec-prod/v2/node_modules/.pnpm/[email protected][email protected]/node_modules/respec/tools/respec2html.js:254:38)
          at async file:///home/runner/work/_actions/w3c/spec-prod/v2/node_modules/.pnpm/[email protected][email protected]/node_modules/respec/tools/respec2html.js:215:5
    Command `respec -s "http://localhost:3000/index.html" -o "index.html.built.html" --verbose -t 20 -e` failed with exit code: 1.
  Error: Process completed with exit code 1.

[2] https://github.com/w3c/spec-prod/blob/796e4101600225fe24d1e967416e348fefdcc266/src/build.ts#L102