gitlab-ci: disable building session managers

...except in the build_session_managers job.

This decouples pipewire's CI from wireplumber's dependencies
and potential failures. The build_session_managers job is supposed
to catch session manager integration errors, not any other job.

.gitlab-ci.yml

@@ -224,6 +224,8 @@ build_on_ubuntu:
     - .fdo.distribution-image@ubuntu
     - .build
   stage: build
+  variables:
+    MESON_OPTIONS: "-Dsession-managers=[]"
 
 .build_on_fedora:
   extends:
@@ -249,6 +251,7 @@ build_on_fedora:
         -Dvulkan=enabled
         -Dsdl2=enabled
         -Dsndfile=enabled
+        -Dsession-managers=[]
   artifacts:
     name: pipewire-$CI_COMMIT_SHA
     when: always
@@ -263,6 +266,8 @@ build_on_alpine:
     - .fdo.distribution-image@alpine
     - .build
   stage: build
+  variables:
+    MESON_OPTIONS: "-Dsession-managers=[]"
 
 # build with all auto() options enabled
 build_all:
@@ -271,7 +276,14 @@ build_all:
   variables:
     # Fedora doesn't have libfreeaptx, lc3plus, lc3, or roc
     # libcamera has no stable API, so let's not chase that target
-    MESON_OPTIONS: "-Dauto_features=enabled -Dbluez5-codec-aptx=disabled -Dbluez5-codec-lc3plus=disabled -Dbluez5-codec-lc3=disabled -Droc=disabled -Dlibcamera=disabled"
+    MESON_OPTIONS: >-
+        -Dauto_features=enabled
+        -Dbluez5-codec-aptx=disabled
+        -Dbluez5-codec-lc3plus=disabled
+        -Dbluez5-codec-lc3=disabled
+        -Droc=disabled
+        -Dlibcamera=disabled
+        -Dsession-managers=[]
   parallel:
     matrix:
       - CC: [gcc, clang]
@@ -281,7 +293,7 @@ build_with_no_commandline_options:
   extends:
     - .build_on_fedora
   variables:
-    MESON_OPTIONS: ""
+    MESON_OPTIONS: "-Dsession-managers=[]"
   parallel:
     matrix:
       - CC: [gcc, clang]
@@ -297,7 +309,7 @@ build_with_custom_options:
         MESON_OPTION_VALUE: [enabled, disabled]
   script:
     - echo "Building with -D$MESON_OPTION=$MESON_OPTION_VALUE"
-    - meson "$BUILD_DIR" . --prefix="$PREFIX" "-D$MESON_OPTION=$MESON_OPTION_VALUE"
+    - meson "$BUILD_DIR" . --prefix="$PREFIX" "-D$MESON_OPTION=$MESON_OPTION_VALUE" -Dsession-managers=[]
     - ninja $NINJA_ARGS -C "$BUILD_DIR"
     - ninja $NINJA_ARGS -C "$BUILD_DIR" test
 
@@ -308,7 +320,7 @@ build_release:
   extends:
     - .build_on_fedora
   variables:
-    MESON_OPTIONS: "-Dtest=enabled -Dbuildtype=release -Db_ndebug=true"
+    MESON_OPTIONS: "-Dtest=enabled -Dbuildtype=release -Db_ndebug=true -Dsession-managers=[]"
   parallel:
     matrix:
       - CC: [gcc, clang]
@@ -364,6 +376,8 @@ valgrind:
     - echo "Building with meson options $MESON_OPTIONS"
     - meson "$BUILD_DIR" . --prefix="$PREFIX" $MESON_OPTIONS
     - meson test -C "$BUILD_DIR" --setup=valgrind
+  variables:
+    MESON_OPTIONS: "-Dsession-managers=[]"
 
 build_with_coverity:
   extends:
@@ -384,6 +398,7 @@ build_with_coverity:
         -Dvulkan=enabled
         -Dsdl2=enabled
         -Dsndfile=enabled
+        -Dsession-managers=[]
     - cov-configure --config coverity_conf.xml
         --comptype gcc --compiler cc --template
         --xml-option=append_arg@C:--ppp_translator