API only CI

.github/workflows/apionly.yml

@@ -0,0 +1,30 @@
+name: Invidious CI
+on:
+  push:
+    branches:
+      - "master"
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    name: "build"
+    steps:
+      - uses: actions/checkout@v3
+      - uses: crystal-lang/install-crystal@v1.6.0
+        with:
+          crystal: 1.5.0
+      - name: Cache Shards
+        uses: actions/cache@v3
+        with:
+          path: ./lib
+          key: shards-${{ hashFiles('shard.lock') }}
+      - name: Install Shards
+        run: |
+          if ! shards check; then
+            shards install
+          fi
+      - run: crystal build -Dapi_only src/invidious.cr
+      - uses: actions/upload-artifact@v2.3.1
+        with:
+          name: invidious
+          path: ./invidious