package/ci: add CircleCI job dependencies to reduce credit usage.

package/ci/circleci.yml

@@ -289,11 +289,30 @@ jobs:
 workflows:
   version: 2
   build:
+    # While there's no actual execution or data dependency between the jobs,
+    # this is done in order to reduce unnecessary credit usage. The GL and
+    # non-deprecated Linux builds are taken as the main sanity checks. Only if
+    # they pass, the rest of the jobs gets gradually executed, with further
+    # dependencies especially for the macOS jobs that take the most credits.
     jobs:
     - linux-gl
-    - linux-gles2
-    - linux-gles3
-    - linux-static
-    - macos-gl
-    - macos-gles3
-    - macos-static
+    - linux-gles2:
+        requires:
+        - linux-gl
+    - linux-gles3:
+        requires:
+        - linux-gl
+    - linux-static:
+        requires:
+        - linux-gl
+    - macos-gl:
+        requires:
+        - linux-gl
+    - macos-gles3:
+        requires:
+        - linux-gles3
+        - macos-gl
+    - macos-static:
+        requires:
+        - linux-static
+        - macos-gl