Optimize package manager install step for GitLab CI

* Try reverting to dashboard image

* Try reverting to original path for Bundler

* Temporary: Avoid pulling cache for install

Assumption that the cache may be invalid given changes to paths

* Remove gitlab-ci.yml from files

Max 2 items in file key

* Include .gitlab-ci.yml in dependency cache key

Since it may alter what paths are included in the cache

* Set deployment via bundle config

Resolve deprecation message:

"[DEPRECATED] The `--deployment` flag is deprecated because it relies on being remembered across bundler invocations, which bundler will no longer do in future versions. Instead please use `bundle config set deployment true`, and stop using this flag"

* Remove --without flag for bundler

Currently no groups defined in Gemfile

* Use default bundle path for depdencies

Avoid needing to specify extra flag

Ref: https://bundler.io/v2.5/man/bundle-install.1.html#DEPLOYMENT-MODE

"Gems are installed to vendor/bundle not your default system location"

* Remove extra check step for bundler

Seems redundant / repeated, and likely to reduce overall performance

* Flatten path for bundler dependencies

* Remove NVM and Bundler install steps

Assumed to be the version we want via IdP image

* Use latest IdP image for CI

.gitlab-ci.yml

@@ -1,4 +1,4 @@
-# Jobs defined here use the idp/ci docker image from ECR by default.
+# Jobs defined here use the dashboard/ci docker image from ECR by default.
 # Images are built via the identity-devops GitLab pipeline.
 
 variables:
@@ -21,19 +21,13 @@ stages:
         - Gemfile.lock
         - package-lock.json
     paths:
-      - vendor/ruby
+      - vendor/bundle
       - .npm-cache/
     policy: pull
 
 .bundle_npm_install: &bundle_npm_install
-  - export BASH_ENV="$HOME/.bash.env"
-  - wget -qO- https://raw.githubusercontent.com/nvm-sh/nvm/$NVM_VERSION/install.sh | bash
-  - export NVM_DIR="$HOME/.nvm"
-  - . "$NVM_DIR/nvm.sh" --install --latest-npm
-  - echo 'export NVM_DIR="$HOME/.nvm"' >> $BASH_ENV
-  - echo '[ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh"' >> $BASH_ENV
-  - gem install bundler --version $BUNDLER_VERSION
-  - bundle check || bundle install --deployment --jobs=4 --retry=3 --without deploy development doc production --path vendor/ruby
+  - bundle config set deployment true
+  - bundle install --jobs=4 --retry=3
   - npm ci --cache .npm-cache --prefer-offline
 
 install: