[glib] (14 commits) ...Merge branch 'ci-update' into 'master'

[Philip Withnall <pwithnall src gnome org>]

Summary of changes:

  7875f34... ci: Update the Docker image for Fedora (*)
  99d068f... ci: Add clang and scan-build (*)
  6cb6b41... Add a version check for duplicated-branches warning (*)
  eb55d64... Check GCC version before ignoring diagnostic message (*)
  2515015... ci: Add Debian stable Docker image (*)
  d42a551... ci: Rename the Fedora Dockerfile (*)
  b4d920f... ci: Beef up run-docker.sh (*)
  92fbdb5... ci: Add an Android NDK Docker image (*)
  15d13d1... ci: Add a MinGW Docker image (*)
  ee9afb3... ci: Remove Android and MingW bits from the fedora Dockerfil (*)
  397e44f... ci: Update the Android NDK image to Fedora 28 (*)
  992e7ce... ci: Move to per-job images (*)
  0b609b5... ci: Add a debian-stable job (*)
  48b037f... Merge branch 'ci-update' into 'master'

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