ci: remove upstreams template (sneaky)

.github/workflows/CI.yml

@@ -1,29 +0,0 @@
-name: CI
-
-on: [ push, pull_request ]
-
-jobs:
-  build:
-    runs-on: ubuntu-20.04
-
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v2
-
-      - name: Cache
-        uses: actions/cache@v2
-        with:
-          path: |
-            ~/.m2/repository
-            ~/.cache/runelite
-          key: ${{ runner.os }}-cache-${{ hashFiles('**/pom.xml', '**/build.sh') }}
-          restore-keys: |
-            ${{ runner.os }}-cache-
-
-      - name: Set up JDK 11
-        uses: actions/setup-java@v1
-        with:
-          java-version: 11
-
-      - name: Build
-        run: ./ci/build.sh