Corrections to presubmit.yml

The project's .bazelrc does not apply in BCR checks, so the values
contained are now given as build_flag(s)

Author: HoloRin

presubmit.yml

@@ -16,11 +16,14 @@ tasks:
     - ./kerl install ${ERLANG_VERSION} ~/kerl/${ERLANG_VERSION}
     - |
         ERLANG_HOME="$(realpath ~/kerl/${ERLANG_VERSION})"
-        cat << EOF >> user.bazelrc
+        cat << EOF >> .bazelrc
           build --@rules_erlang//:erlang_version=${ERLANG_VERSION}
           build --@rules_erlang//:erlang_home=${ERLANG_HOME}
         EOF
     build_flags:
+    - --incompatible_strict_action_env
     - --extra_toolchains=@rules_erlang//:erlang_toolchain_external
+    - --platforms=@rules_erlang//platforms:erlang_external_platform
+    - --extra_execution_platforms=@rules_erlang//platforms:erlang_external_platform
     build_targets:
     - '@rules_erlang//...'