ci: Brush up repo for publishing – post-release fixes (#70)

# What ❔

Fixes the release workflow.

## Why ❔

The release workflow is currently broken.

.github/workflows/release-please-prepare-branch.yml

@@ -64,6 +64,6 @@ jobs:
           git config --global user.email "[email protected]"
           git config --global user.name "zksync-era-bot"
           git remote set-url origin 'https://${{ secrets.RELEASE_TOKEN }}@github.com/matter-labs/vm2.git'
-          git add ./Cargo.toml
+          git add ./Cargo.toml ./Cargo.lock
           git commit -m "$EXPECTED_COMMIT_MESSAGE"
           git push

.github/workflows/release-please.yml

@@ -58,7 +58,8 @@ jobs:
         run: cargo install cargo-workspaces
 
       - name: Build each package separately
-        run: cargo ws exec cargo build
+        # Ignore the fuzzing crate which requires a wrapper to build
+        run: cargo ws exec --ignore-private cargo build
 
       - name: Login to crates.io
         run: cargo login ${{ secrets.CRATES_IO_TOKEN }}