Cache idf_versions.json on build time so we have target selection avalible in case of offline installation

Author: Hahihula

.github/workflows/build.yaml

@@ -97,7 +97,7 @@ jobs:
             ~/.cargo/registry
             ~/.cargo/git
             target
-          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
+          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') || 'no-lock' }}
           restore-keys: ${{ runner.os }}-cargo-
 
       - name: Build and Test Library