[bazel] Tag //:rbe_container_skia_infra as a manual build target.

Said target can take several minutes to build. This CL excludes the target from wildcard queries such as "bazel build //...",, which speeds up the Bazel tryjobs.

This CL makes iterating on the tryjobs a bit faster for me. We'll remove the manual tag after the tryjobs land.

Bug: skia:11111
Change-Id: I746daabb0a88c725ffaff7f323a6bc2584d6d6e7
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/371762
Reviewed-by: Leandro Lovisolo <lovisolo@google.com>
diff --git a/BUILD.bazel b/BUILD.bazel
index 535dd4c..287e11f 100644
--- a/BUILD.bazel
+++ b/BUILD.bazel
@@ -182,7 +182,10 @@
         "git config --system user.email 'bazel-rbe-test-user@example.com'",
     ],
     image = "@rbe_ubuntu1604//image",
-    tags = ["no-remote"],
+    tags = [
+        "manual",  # Exclude it from wildcard queries, e.g. "bazel build //...".
+        "no-remote",
+    ],
 )
 
 # This target can be used to upload the custom RBE container toolchain to GCR. It will be available
@@ -196,6 +199,10 @@
     registry = "gcr.io",
     repository = "skia-public/rbe-container-skia-infra",
     tag = "{STABLE_DOCKER_TAG}",
+    tags = [
+        "manual",  # Exclude it from wildcard queries, e.g. "bazel build //...".
+        "no-remote",  # We cannot build :rbe_container_skia_infra on RBE.
+    ],
 )
 
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