Make compilation to fail on warnings

.github/workflows/compile-no-warnings.yml

@@ -0,0 +1,29 @@
+---
+name: No-Warnings Compilation
+
+"on":
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  basic-compilation:
+    name: Compilation with no warnings
+    runs-on: ubuntu-latest
+    container:
+      # To refresh: skopeo inspect --no-tags docker://quay.io/keylime/keylime-ci:latest | jq -r '.Digest'
+      image: quay.io/keylime/keylime-ci@sha256:973f36045d0dd0b1a219dd88f06625c65a77f267842ee23d955e0c095ef09ff2
+    steps:
+      - uses: actions/checkout@v6
+      - name: Set git safe.directory for the working directory
+        run: git config --system --add safe.directory "$PWD"
+      - name: Check compilation (no warnings)
+        run: RUSTFLAGS="-D warnings" cargo build
+      - name: Check test compilation (no warnings)
+        run: RUSTFLAGS="-D warnings" cargo test --no-run
+      - name: Check clippy errors (no warnings included)
+        run: cargo clippy --all-features --all-targets -- -D clippy::all -D warnings

keylime/src/context_info.rs

@@ -790,7 +790,6 @@ impl ContextInfo {
 mod uefi_log_tests {
     use super::base64_standard;
     use super::*;
-    use base64::Engine as _;
 
     /// Cached bytes are preferred over the on-disk file.
     ///