Implementation of tx circuit (shortcut 1)

.github/workflows/ci.yml

@@ -47,11 +47,16 @@ jobs:
             ~/.cargo/git/db/
             target/
           key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
-      - name: Run tests
+      - name: Run light tests # light tests are run in parallel
         uses: actions-rs/cargo@v1
         with:
           command: test
           args: --verbose --release --all --all-features --exclude integration-tests --exclude circuit-benchmarks
+      - name: Run heavy tests # heavy tests are run serially to avoid OOM
+        uses: actions-rs/cargo@v1
+        with:
+          command: test
+          args: --verbose --release --all --all-features --exclude integration-tests --exclude circuit-benchmarks serial_ -- --ignored --test-threads 1
 
   build:
     if: github.event.pull_request.draft == false