Use self-hosted Bazel cache (#123)

## What is the goal of this PR?

Speed up CI by using self-hosted remote Bazel cache

## What are the changes implemented in this PR?

Import `/opt/credentials/bazel-remote-cache.rc`which configures remote caching

Author: vmax

.bazelrc

@@ -19,11 +19,5 @@ build --incompatible_strict_action_env --javacopt='--release 8'
 run --incompatible_strict_action_env
 test --incompatible_strict_action_env
 
-# what is defined in this section will be applied when bazel is invoked like this: bazel ... --config=rbe ...
-build:rbe --project_id=grakn-dev
-build:rbe --remote_cache=cloud.buildbuddy.io
-build:rbe --bes_backend=cloud.buildbuddy.io
-build:rbe --bes_results_url=https://app.buildbuddy.io/invocation/
-build:rbe --tls_client_certificate=/opt/credentials/buildbuddy-cert.pem
-build:rbe --tls_client_key=/opt/credentials/buildbuddy-key.pem
-build:rbe --remote_timeout=3600
+try-import /opt/credentials/bazel-remote-cache.rc
+