Fix env

Author: SimonErm

.github/workflows/main.yml

@@ -49,7 +49,7 @@ jobs:
           key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
       - run: cargo test --locked
         env:
-          LLVM_PROFILE_FILE=: target/debug/coverage/grcov-%p-%m.profraw
+          LLVM_PROFILE_FILE: target/debug/coverage/grcov-%p-%m.profraw
           RUSTFLAGS: -Cinstrument-coverage
       - name: Generate coverage
         run: |