Fix UI tests to specific toolchain version

.gitlab-ci.yml

@@ -109,11 +109,15 @@ test-dylint:
   stage:                           test
   <<:                              *docker-env
   script:
+    # We need to fix this test to a toolchain because of the UI tests
+    # We can't use stable here because the UI tests freak out if there are dots in the drivers file name
+    - rustup default nightly-2022-06-30
+    - rustup component add rustfmt clippy rust-src rustc-dev llvm-tools-preview
+
     - rusty-cachier snapshot create
     - cd ink_linting/
     - mv _Cargo.toml Cargo.toml
 
-    - export RUSTC_BOOTSTRAP=1
     - cargo check --verbose
     - cargo +nightly fmt --verbose --all -- --check
     - cargo clippy --verbose -- -D warnings;

ink_linting/README.md

@@ -13,5 +13,8 @@ cargo build --release
 
 # Run the linting on a contract.
 DYLINT_LIBRARY_PATH=$PWD/target/release cargo dylint contract_instantiated
-    --manifest-path ../ink/examples/erc20/Cargo.toml 
-```
+    --manifest-path ../ink/examples/erc20/Cargo.toml
+
+# The UI tests are written against a specific toolchain version. If you wish to run them locally:
+cargo +nightly-2022-06-30 test
+```