feat(target_chains/near): add reproducible build to ci

Author: Riateche

.github/workflows/ci-near-contract.yml

@@ -16,7 +16,8 @@ env:
   CARGO_TERM_COLOR: always
 
 jobs:
-  build:
+  test:
+    name: Workspace test
     runs-on: ubuntu-latest
     defaults:
       run:
@@ -25,3 +26,13 @@ jobs:
       - uses: actions/checkout@v2
       - name: Test
         run: ./workspace-test.sh
+  reproducible-build:
+    name: Reproducible build
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: target_chains/near/receiver
+    steps:
+      - uses: actions/checkout@v2
+      - run: cargo +stable install --locked cargo-near@0.13.3
+      - run: cargo near build reproducible-wasm