factorize env for cargo

Author: dkm

.github/actions/build-gcc/action.yml

@@ -38,10 +38,12 @@ runs:
                   gcc-multilib \
                   g++-multilib \
                   dejagnu;
-          # install Rust directly using rustup
-          curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain=1.72.0;
       shell: bash
 
+    - uses: dtolnay/rust-toolchain@stable
+      with:
+        toolchain: "1.72.0"
+
     - name: Make Source Read-Only
       run: chmod -R a-w ./*
       shell: bash
@@ -62,7 +64,7 @@ runs:
       run: |
            cd gccrs-build; \
            # Add cargo to our path quickly
-           . "$HOME/.cargo/env";
+           # . "$HOME/.cargo/env";
            make -Otarget -j $(nproc) 2>&1 | tee log
 
     - name: Check for new warnings