CI test

.github/workflows/rust.yml

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+name: build
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - run: rustup toolchain install stable --profile minimal
+    - uses: Swatinem/rust-cache@v2
+      with:
+        # An explicit cache key that is used instead of the automatic `job`-based
+        # cache key and is thus stable across jobs.
+        # Default: empty
+        shared-key: ""
+        # An additional cache key that is added alongside the automatic `job`-based
+        # cache key and can be used to further differentiate jobs.
+        # Default: empty
+        key: ""
+        # A whitespace separated list of env-var *prefixes* who's value contributes
+        # to the environment cache key.
+        # The env-vars are matched by *prefix*, so the default `RUST` var will
+        # match all of `RUSTC`, `RUSTUP_*`, `RUSTFLAGS`, `RUSTDOC_*`, etc.
+        # Default: "CARGO CC CFLAGS CXX CMAKE RUST"
+        env-vars: ""
+        # The cargo workspaces and target directory configuration.
+        # These entries are separated by newlines and have the form
+        # `$workspace -> $target`. The `$target` part is treated as a directory
+        # relative to the `$workspace` and defaults to "target" if not explicitly given.
+        # Default: ". -> target"
+        workspaces: ""
+        # Determines if the cache should be saved even when the workflow has failed.
+        # Default: "false"
+        cache-on-failure: ""
+    - uses: actions/checkout@v2
+    - name: Build
+      run: cd egui-client && cargo build --verbose