Fix cargo path in CI workflow

- Use 'cargo' directly instead of full path
- Dockerfile sets PATH to include /usr/local/cargo/bin
- Fixes 'No such file or directory' error for cargo command
- Rust toolchain now properly accessible in container

.forgejo/workflows/ci.yml

@@ -89,7 +89,7 @@ jobs:
             cd bootupd && \
             git fetch --all && \
             git switch origin/sdboot-support -d && \
-            /root/.cargo/bin/cargo build --release --bins --features systemd-boot && \
+            cargo build --release --bins --features systemd-boot && \
             install -Dpm0755 -t /usr/bin ./target/release/bootupd && \
             ln -s ./bootupd /usr/bin/bootupctl && \
             cp /usr/bin/bootupd /workspace/ && \