ZSA integration (step 1): Integrate ZSA-compatible crates into Zebra while maintaining original Orchard (Vanilla) support for now [to upstream]

.cargo/config.toml

@@ -3,6 +3,9 @@
 # Flags that apply to all Zebra crates and configurations
 [target.'cfg(all())']
 rustflags = [
+    # FIXME: Consider removing this line later (it's needed for the ZSA version of librustzcash crates)
+    "--cfg", "zcash_unstable=\"nu6\"",
+
     # Zebra standard lints for Rust 1.65+
 
     # High-risk code

.github/workflows/ci-basic.yml

@@ -0,0 +1,35 @@
+name: Basic checks
+
+#on: [push, pull_request]
+on: [push]
+
+jobs:
+  test:
+    name: Test on ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-24.04]
+
+    env:
+      # Use system-installed RocksDB library instead of building from scratch
+      ROCKSDB_LIB_DIR: /usr/lib
+      # Use system-installed Snappy library for compression in RocksDB
+      SNAPPY_LIB_DIR: /usr/lib/x86_64-linux-gnu
+      # Enable the `nu6` feature in `zcash_protocol`
+      RUSTFLAGS: '--cfg zcash_unstable="nu6"'
+      RUSTDOCFLAGS: '--cfg zcash_unstable="nu6"'
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install dependencies on Ubuntu
+        #run: sudo apt-get update && sudo apt-get install -y protobuf-compiler build-essential librocksdb-dev
+        run: sudo apt-get update && sudo apt-get install -y protobuf-compiler librocksdb-dev
+      - name: Run tests
+        run: cargo test --verbose
+      - name: Verify working directory is clean
+        run: git diff --exit-code
+      - name: Run doc check
+        run: cargo doc --all-features --document-private-items
+      - name: Run format check
+        run: cargo fmt -- --check