gitlab-ci: check all .yml files with yamllint

fdroidserver!721

.gitlab-ci.yml

@@ -7,7 +7,7 @@ lint:
       - schedules
       - pipelines
   before_script:
-    - printf "Package\x3a androguard fdroidserver python3-asn1crypto python3-ruamel.yaml\nPin\x3a release a=stretch-backports\nPin-Priority\x3a 500\n" > /etc/apt/preferences.d/debian-stretch-backports.pref
+    - printf "Package\x3a androguard fdroidserver python3-asn1crypto python3-ruamel.yaml yamllint\nPin\x3a release a=stretch-backports\nPin-Priority\x3a 500\n" > /etc/apt/preferences.d/debian-stretch-backports.pref
     - echo "deb http://deb.debian.org/debian/ stretch-backports main" > /etc/apt/sources.list.d/backports.list
     - apt-get update
     - apt-get -qy dist-upgrade
@@ -33,7 +33,8 @@ lint:
            fi;
         done;
         set -x;
-        apt-get install python3-colorama;
+        apt-get install python3-colorama yamllint;
+        for f in $files; do [[ $f == *'.yml' ]] && yamllint "$f"; done;
         ./tools/check-git-repo-availability.py $files;
         ./tools/audit-gradle.py $CHANGED;
         set +x;

.yamllint

@@ -0,0 +1,28 @@
+extends: default
+
+rules:
+  braces:
+    level: warning
+    max-spaces-inside: 1
+  brackets:
+    level: warning
+    max-spaces-inside: 1
+  colons:
+    level: warning
+  commas:
+    level: warning
+  comments: disable
+  comments-indentation: disable
+  document-start: disable
+  empty-lines: disable
+  hyphens:
+    level: warning
+  indentation:
+    level: warning
+    indent-sequences: consistent
+  line-length: disable
+  new-line-at-end-of-file:
+    level: warning
+  trailing-spaces:
+    level: warning
+  truthy: disable