diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 20d61b70e..695756e47 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -8,10 +8,25 @@ on:
   push:
     branches: [main]
   pull_request:
+    types:
+      - opened
+      - reopened
+      - synchronize
+      - ready_for_review
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+env:
+  USE_RUBY: ${{ vars.USE_RUBY || 'false' }}
+  USE_YQ: ${{ vars.USE_YQ || 'false' }}
+  USE_CACHE: ${{ vars.USE_CACHE || 'false' }}
+  CACHE_FOLDER: ${{ vars.CACHE_FOLDER || '.cache' }}
 
 jobs:
   test:
-    if: "!contains(github.event.head_commit.message, 'skip ci')"
+    if: ${{!contains(github.event.head_commit.message, 'skip ci') && !github.event.pull_request.draft}}
     runs-on: ubuntu-latest
     steps:
       - name: Checkout project (pull-request)
@@ -28,10 +43,12 @@ jobs:
         with:
           java-version: adopt@1.11
       - name: Setup Ruby
+        if: ${{ env.USE_RUBY == 'true' }}
         uses: ruby/setup-ruby@v1
         with:
           ruby-version: .ruby-version
       - name: Setup yq
+        if: ${{ env.USE_YQ == 'true' }}
         run: sudo snap install yq
       - name: Run pre-conditions
         run: test -f .github/actions.yml && eval "$(yq e '.pre.ci // "true"' .github/actions.yml)" || true
@@ -42,10 +59,26 @@ jobs:
         uses: stefanzweifel/git-auto-commit-action@v4.5.1
         with:
           commit_message: Run formatter/linter
+      - name: Restore cache
+        id: ci-cache-restore
+        if: ${{ env.USE_CACHE == 'true' }}
+        uses: actions/cache/restore@v3
+        with:
+          path: |
+            ${{ env.CACHE_FOLDER }}
+          key: ci-cache-key
       - name: Run checks
         run: sbt ci-test
         env:
           GITHUB_TOKEN: ${{ secrets.ADMIN_GITHUB_TOKEN }}
+      - name: Save cache
+        id: ci-cache-save
+        if: ${{ env.USE_CACHE == 'true' }}
+        uses: actions/cache/save@v3
+        with:
+          path: |
+            ${{ env.CACHE_FOLDER }}
+          key: ${{ steps.ci-cache-restore.outputs.cache-primary-key }}
       - name: Run post-conditions
         run: test -f .github/actions.yml && eval "$(yq e '.post.ci // "true"' .github/actions.yml)" || true
       - name: Automerge Scala Steward PRs
diff --git a/.gitignore b/.gitignore
index 6b1e652d8..c35d6f7fb 100644
--- a/.gitignore
+++ b/.gitignore
@@ -35,8 +35,16 @@ project/plugins/project/
 .bloop/
 .metals/
 metals.sbt
+
+### Scala-CLI ###
+
 .scala-build/
 
+### Mill ###
+
+# Techinically a duplicate of the IDEA section.
+out/
+
 ### Vim ###
 
 # Swap
@@ -74,6 +82,13 @@ tags
 !.vscode/launch.json
 !.vscode/extensions.json
 
-# Direnv
+### Direnv ###
 
 .direnv
+.envrc
+
+### JavaScript / NPM / Yarn / Bundlers ###
+
+node_modules
+.parcel-cache
+dist