fix(plugins): enforce rustc compatibility

BREAKING CHANGE: API v4+ plugin packages must declare the exact rustc version used to build the binary.

Refs #901

docs/plugin-template/.github/workflows/release.yml

@@ -36,7 +36,7 @@ jobs:
         run: |
           mkdir -p dist
           cp target/release/*.${{ matrix.ext }} "dist/${{ matrix.asset }}"
-          cp plugin.toml dist/plugin.toml
+          sed "s|__RUSTC_VERSION__|$(rustc --version)|" plugin.toml > dist/plugin.toml
       - uses: softprops/action-gh-release@v2
         with:
           files: |