CI: GitHub: try instaling tasty-discover explicitly into the PATH

Author: Anton-Latukha

.github/workflows/Cabal-Linux.yml

@@ -37,6 +37,7 @@ jobs:
           ghc-version: ${{ matrix.ghc }}
       - name: "Install additional system packages"
         run: sudo apt install libsodium-dev
+      - run: cabal v2-install tasty-discover
       - run: cabal v2-configure --disable-optimization --enable-tests --enable-deterministic
         if: matrix.packageRoot == 'hnix-store-core'
       - run: |