Update Cargo.toml version when publishing main to NPM (#3709)

Summary:
With this change the compiler in OSS will show the correct version:

Pull Request resolved: #3709

Test Plan:
Logs in the CI indicating the correct version:
```
   Compiling relay-compiler v0.0.0-main-0f540a5c (/home/runner/work/relay/relay/compiler/crates/relay-compiler)
```

**Static Docs Preview: relay**
|[Full Site](https://our.intern.facebook.com/intern/staticdocs/eph/D33352352/V2/relay/)|

|**Modified Pages**|

Reviewed By: rbalicki2

Differential Revision: D33352352

Pulled By: alunyov

fbshipit-source-id: 66419787971cb18e458dee271d54e6bc0c74972f

.github/workflows/ci.yml

@@ -105,6 +105,19 @@ jobs:
           toolchain: stable
           override: true
           target: ${{ matrix.target.target }}
+      - uses: actions/setup-node@v2
+        if: github.event_name == 'push' && github.repository == 'facebook/relay' && github.ref == 'refs/heads/main'
+        with:
+          node-version: 16.x
+          cache: 'yarn'
+      - name: Install dependencies
+        if: github.event_name == 'push' && github.repository == 'facebook/relay' && github.ref == 'refs/heads/main'
+        run: yarn install --frozen-lockfile --ignore-scripts
+      - name: Set the compiler version when releasing the `main` branch
+        if: github.event_name == 'push' && github.repository == 'facebook/relay' && github.ref == 'refs/heads/main'
+        run: yarn gulp setCompilerMainVersion
+        env:
+          RELEASE_COMMIT_SHA: ${{ github.sha }}
       - uses: actions-rs/cargo@v1
         with:
           command: build

gulpfile.js

@@ -389,6 +389,26 @@ const setMainVersion = async () => {
   });
 };
 
+async function setCompilerMainVersion() {
+  if (!RELEASE_COMMIT_SHA) {
+    throw new Error('Expected the RELEASE_COMMIT_SHA env variable to be set.');
+  }
+  const currentVersion = require('./package.json').version;
+  const compilerCargoFile = path.join(
+    '.',
+    'compiler',
+    'crates',
+    'relay-compiler',
+    'Cargo.toml',
+  );
+  const cargo = fs.readFileSync(compilerCargoFile, 'utf8');
+  const updatedCargo = cargo.replace(
+    `version = "${currentVersion}"`,
+    `version = "${VERSION}"`,
+  );
+  fs.writeFileSync(compilerCargoFile, updatedCargo, 'utf8');
+}
+
 const cleanbuild = gulp.series(clean, dist);
 
 exports.clean = clean;
@@ -398,3 +418,4 @@ exports.mainrelease = gulp.series(cleanbuild, relayCompiler, setMainVersion);
 exports.release = gulp.series(cleanbuild, relayCompiler);
 exports.cleanbuild = cleanbuild;
 exports.default = cleanbuild;
+exports.setCompilerMainVersion = setCompilerMainVersion;