[gjs/gnome-3-34] (21 commits) ...Merge branch 'smaller-ci-phase1' into 'master'

[Philip Chimento <pchimento src gnome org>]

Summary of changes:

  1d47c3e... tests: Fix one remaining cppcheck error (*)
  0230c41... CI: Remove non-native architecture builds (*)
  f1d3197... CI: Remove flatpak build (*)
  bec2241... CI: Remove tokei build (*)
  9b100fa... CI: Remove separate Ubuntu jobs (*)
  9d9c9ab... import Mapping documentation from the wiki (*)
  adca990... import Modules documentation from the wiki (*)
  96f1f95... import Understanding-SpiderMonkey-code documentation from t (*)
  fbc8b44... import Package Specification documentation from the wiki (*)
  f33c857... import Home documentation from the wiki (*)
  cb51391... Merge branch 'import-wiki-doc' into 'master' (*)
  f0a99cb... CI: Switch eslint job to a ready-made Docker image (*)
  20b8263... CI: Switch cppcheck job to a ready-made Docker image (*)
  192614a... CI: Rename "fedora_gcc" job to "distcheck" (*)
  ac38c10... CI: Use variables expressions to skip linter and image buil (*)
  4dd2b09... CI: Remove "DEV" variable from Docker image generation (*)
  cb89602... CI: Rename "STATIC" variable to "MOZJS_BRANCH" (*)
  a2bef43... CI: Remove jhbuild from CI scripts (*)
  b7e84f4... CI: Port test-ci.sh to POSIX shell (*)
  bfb7de0... CI: Skip linter jobs if no linted files modified (*)
  be50074... Merge branch 'smaller-ci-phase1' into 'master' (*)

(*) This commit already existed in another branch; no separate mail sent