fix(ci): template injection

Author: aagbotemi

.github/workflows/cont_integration.yml

@@ -24,7 +24,11 @@ jobs:
         uses: actions/checkout@v4
 
       - name: "Generate cache key"
-        run: echo "${{ matrix.rust.version }} ${{ matrix.features }}" | tee .cache_key
+        env:
+          MATRIX_RUST_VERSION: ${{ matrix.rust.version }}
+          MATRIX_FEATURES: ${{ matrix.features }}
+        run: echo "$MATRIX_RUST_VERSION $MATRIX_FEATURES" | tee .cache_key
+        # run: echo "${{ matrix.rust.version }} ${{ matrix.features }}" | tee .cache_key
 
       - name: "Cache"
         uses: actions/cache@v3
@@ -36,7 +40,10 @@ jobs:
           key: ${{ runner.os }}-cargo-${{ hashFiles('.cache_key') }}-${{ hashFiles('**/Cargo.toml','**/Cargo.lock') }}
 
       - name: "Set default toolchain"
-        run: rustup default ${{ matrix.rust.version }}
+        env:
+          MATRIX_RUST_VERSION: ${{ matrix.rust.version }}
+        run: rustup default $MATRIX_RUST_VERSION
+        # run: rustup default ${{ matrix.rust.version }}
 
       - name: "Set profile"
         run: rustup set profile minimal