ci: Skip UI tests on Rust 1.34.2

trybuild uses some cargo options that aren't supported yet

Author: meithecatte

.github/workflows/rust.yml

@@ -7,6 +7,9 @@ jobs:
     strategy:
       matrix:
         rust: [nightly, stable, 1.34.2]
+        include:
+          - rust: 1.34.2
+            extra-test-opts: -- --skip ui
     runs-on: ubuntu-latest
 
     steps:
@@ -17,7 +20,7 @@ jobs:
         profile: minimal
         default: true
     - run: cargo build
-    - run: cargo test --all
+    - run: cargo test --all ${{ matrix.extra-test-opts }}
   clippy:
     runs-on: ubuntu-latest
     steps: