Update .gitlab-ci.yml file

.gitlab-ci.yml

 # The Docker image that will be used to build your app
-image: rust
+image: alpine
 # Functions that should be executed before the build script is run
 before_script:
-  - wget -qO-
-    https://github.com/thedodd/trunk/releases/latest/download/trunk-x86_64-unknown-linux-gnu.tar.gz
-    | tar -xzf-
+  - wget -qO- https://github.com/thedodd/trunk/releases/latest/download/trunk-x86_64-unknown-linux-gnu.tar.gz | tar -xzf-
+  - curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
+  - rustup target add wasm32-unknown-unknown
 pages:
   script:
     - ./trunk build --release --public-url "$CI_PAGES_URL"
+    - mv dist public
   artifacts:
     paths:
       # The folder that contains the files to be exposed at the Page URL