Don't build //toolchains/... on CI

.bazelci/presubmit.yml

@@ -6,9 +6,12 @@ tasks:
   ubuntu2004:
     build_targets:
     - "//..."
+    - "-//toolchains/..."
   macos:
     build_targets:
     - "//..."
+    - "-//toolchains/..."
   windows:
     build_targets:
     - "//..."
+    - "-//toolchains/..."

toolchains/BUILD

@@ -46,9 +46,10 @@ java_host_runtime_alias(name = "current_host_java_runtime")
 java_toolchain_alias(name = "current_java_toolchain")
 
 # Aliases value of --plugins flag as a JavaPluginInfo
-java_plugins_flag_alias(
-    name = "java_plugins_flag_alias",
-)
+# TODO: java_plugins_flag_alias cannot be used in rules_java
+# java_plugins_flag_alias(
+#     name = "java_plugins_flag_alias",
+# )
 
 # This is necessary to get the *host* Java runtime. Depending on
 # //tools/jdk:current_java_runtime from an attribute with the host transition
@@ -413,24 +414,25 @@ filegroup(
     visibility = ["//tools:__pkg__"],
 )
 
-py_binary(
-    name = "proguard_whitelister",
-    srcs = [
-        "proguard_whitelister.py",
-    ],
-    deps = [
-        "//third_party/py/abseil",
-    ],
-)
-
-py_test(
-    name = "proguard_whitelister_test",
-    srcs = ["proguard_whitelister_test.py"],
-    data = ["proguard_whitelister_test_input.pgcfg"],
-    deps = [
-        ":proguard_whitelister",
-    ],
-)
+# TODO: should those targets stay in rules_java?
+# py_binary(
+#     name = "proguard_whitelister",
+#     srcs = [
+#         "proguard_whitelister.py",
+#     ],
+#     deps = [
+#         "//third_party/py/abseil",
+#     ],
+# )
+# 
+# py_test(
+#     name = "proguard_whitelister_test",
+#     srcs = ["proguard_whitelister_test.py"],
+#     data = ["proguard_whitelister_test_input.pgcfg"],
+#     deps = [
+#         ":proguard_whitelister",
+#     ],
+# )
 
 # Aliases for JDKs, so that they are only downloaded when needed.
 _JDKS = [
@@ -489,8 +491,9 @@ java_runtime_version_alias(
     visibility = ["//visibility:public"],
 )
 
-java_runtime_version_alias(
-    name = "jdk_8",
-    runtime_version = "8",
-    visibility = ["//visibility:public"],
-)
+# TODO: drop JDK 8 support?
+# java_runtime_version_alias(
+#     name = "jdk_8",
+#     runtime_version = "8",
+#     visibility = ["//visibility:public"],
+# )