Account for Elixir containing several core applications

- eex
- elixir
- ex_unit
- iex
- logger
- mix

So that apps (like rabbitmq_cli) can dialyze against the extra
components

bazel/elixir/BUILD.bazel

@@ -12,3 +12,15 @@ elixir_as_app(
     name = "erlang_app",
     visibility = ["//visibility:public"],
 )
+
+elixir_as_app(
+    name = "logger",
+    app = "logger",
+    visibility = ["//visibility:public"],
+)
+
+elixir_as_app(
+    name = "iex",
+    app = "iex",
+    visibility = ["//visibility:public"],
+)

bazel/elixir/elixir_as_app.bzl

@@ -2,13 +2,17 @@ load(
     "@rules_erlang//:erlang_app_info.bzl",
     "ErlangAppInfo",
 )
+load(
+    "@rules_erlang//:util.bzl",
+    "path_join",
+)
 load(
     ":elixir_toolchain.bzl",
     "elixir_dirs",
 )
 
 def _impl(ctx):
-    ebin = ctx.actions.declare_directory("ebin")
+    ebin = ctx.actions.declare_directory(path_join(ctx.label.name, "ebin"))
 
     (elixir_home, elixir_runfiles) = elixir_dirs(ctx)
 
@@ -17,9 +21,10 @@ def _impl(ctx):
         outputs = [ebin],
         command = """set -euo pipefail
 
-cp -r "{elixir_home}"/lib/elixir/ebin/* {ebin}
+cp -r "{elixir_home}"/lib/{app}/ebin/* {ebin}
 """.format(
             elixir_home = elixir_home,
+            app = ctx.attr.app,
             ebin = ebin.path,
         ),
     )
@@ -27,7 +32,7 @@ cp -r "{elixir_home}"/lib/elixir/ebin/* {ebin}
     return [
         DefaultInfo(files = depset([ebin])),
         ErlangAppInfo(
-            app_name = "elixir",
+            app_name = ctx.attr.app,
             include = [],
             beam = [ebin],
             priv = [],
@@ -39,6 +44,9 @@ cp -r "{elixir_home}"/lib/elixir/ebin/* {ebin}
 
 elixir_as_app = rule(
     implementation = _impl,
+    attrs = {
+        "app": attr.string(default = "elixir"),
+    },
     toolchains = [":toolchain_type"],
     provides = [ErlangAppInfo],
 )

deps/rabbitmq_cli/BUILD.bazel

@@ -116,6 +116,7 @@ plt(
     libs = [":elixir"],
     deps = [
         ":elixir",
+        "//bazel/elixir:logger",
         "//deps/rabbit:erlang_app",
         "//deps/rabbit_common:erlang_app",
     ],