CI(macOS): verify rust toolchain after venv activation for editable install

Author: Adithyaphani

.github/workflows/test-mac.yml

@@ -42,11 +42,36 @@ jobs:
             stestr | "${{ runner.os }}"
             stestr
           path: .stestr
+      - name: Set up Rust (minimal, for building qiskit)
+          uses: dtolnay/rust-toolchain@stable
+          with:
+            toolchain: stable
+            profile: minimal
+            components: ""   
+
+      - name: Verify Rust toolchain
+        shell: bash
+        run: |
+          set -e
+          echo "PATH=$PATH"
+          which rustc
+          which cargo
+          rustc -V
+          cargo -V
       - name: "Install dependencies"
+        shell: bash
+        env:
+          RUSTUP_TOOLCHAIN: stable
         run: |
           set -e
           python -m venv test-job
           source test-job/bin/activate
+
+          which rustc
+          which cargo
+          rustc -V
+          cargo -V
+
           python -m pip install -U pip
           python -m pip install -U \
             -c constraints.txt \