Merge branch '5.4' into 6.0

* 5.4:
  Remove not-supported contents directive
  Fail the build when needed
  Bump deps of the builder
  Remove undefined refs

Author: fabpot

.github/workflows/ci.yaml

@@ -45,11 +45,7 @@ jobs:
 
             -   name: "Build the docs"
                 working-directory: _build
-                run: php build.php -vvv
-
-            -   name: Show log file
-                if: ${{ always() }}
-                run: cat _build/logs.txt || true
+                run: php build.php --disable-cache
 
     doctor-rst:
         name: Lint (DOCtor-RST)

_build/build.php

@@ -57,7 +57,11 @@
             $io->error(sprintf("There were some errors while building the docs:\n\n%s\n", $result->getErrorTrace()));
             $io->newLine();
             $io->comment('Tip: you can add the -v, -vv or -vvv flags to this command to get debug information.');
+
+            return 1;
         }
+
+        return 0;
     })
     ->getApplication()
     ->setDefaultCommand('build-docs', true)