ci: remove LSIF index step

.github/workflows/check.yaml

@@ -59,43 +59,6 @@ jobs:
           args: --locked
 
 
-  lsif:
-    name: Generate LSIF index and upload it to Sourcegraph
-    needs: [fetch]
-    runs-on: ubuntu-latest
-    if: github.event_name == 'push'
-
-    steps:
-      - name: Checkout the code
-        uses: actions/checkout@v2
-
-      - name: Install toolchain
-        uses: actions-rs/toolchain@v1
-        with:
-          toolchain: nightly
-          target: x86_64-unknown-linux-musl
-          components: rustfmt
-          profile: minimal
-          override: true
-
-      - name: Setup Cargo cache
-        uses: actions/cache@v2.1.6
-        with:
-          path: |
-            ~/.cargo/registry/index
-            ~/.cargo/registry/cache
-            ~/.cargo/git/db
-          key: ${{ runner.os }}-cargo-deps-msrv-${{ hashFiles('**/Cargo.lock') }}
-
-      - name: Generate LSIF data
-        uses: sourcegraph/lsif-rust-action@v0.1.0
-
-      - name: Upload LSIF data
-        uses: sourcegraph/lsif-upload-action@master
-        with:
-          github_token: ${{ secrets.GITHUB_TOKEN }}
-
-
   rustfmt:
     name: Check style
     needs: [fetch]