Fix issue where bundler was installing plugin gems and project gems (#9)

README.md

@@ -57,7 +57,7 @@ Add a build step using the test-summary plugin:
 ```yaml
   - label: annotate
     plugins:
-      - instacart/test-summary#v1.14.0:
+      - instacart/test-summary#v1.14.3:
           inputs:
             - label: rspec
               artifact_path: artifacts/rspec*

bin/setup

@@ -1,8 +1,4 @@
 #!/usr/bin/env bash
 set -euo pipefail
 
-PLUGIN_BASEDIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && cd .. && pwd )"
-
-bundle install --quiet --gemfile="${PLUGIN_BASEDIR}/Gemfile"
-
-# Do any other automated setup that you need to do here
+bundle install --quiet

hooks/post-artifact

@@ -18,8 +18,8 @@ trap on_failure ERR
 PLUGIN_BASEDIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && cd .. && pwd )"
 
 if [[ ${BUILDKITE_PLUGIN_TEST_SUMMARY_RUN_WITHOUT_DOCKER:-false} = true ]]; then
-    $PLUGIN_BASEDIR/bin/setup
-    $PLUGIN_BASEDIR/bin/run
+    BUNDLE_GEMFILE="$PLUGIN_BASEDIR/Gemfile" $PLUGIN_BASEDIR/bin/setup
+    BUNDLE_GEMFILE="$PLUGIN_BASEDIR/Gemfile" bundler exec $PLUGIN_BASEDIR/bin/run
 else
     TAG=$(git describe --tags --exact-match 2> /dev/null || true)