Fails with --ofline

.github/workflows/ci.yml

@@ -180,6 +180,8 @@ jobs:
         if: contains(matrix.TARGET, '-linux-')
         run: |
           # some additional configuration for cross-compilation on linux
+          # TODO: can this be done with `RUSTFLAGS += -C linker=$(DEB_HOST_GNU_TYPE)-gcc`?
+
           cat >>~/.cargo/config <<EOF
           [target.aarch64-unknown-linux-gnu]
           linker = "aarch64-linux-gnu-gcc"

Dockerfile

@@ -27,7 +27,7 @@ ADD --chown=rust:rust . ./
 # Build our application.
 RUN --mount=type=cache,target=/home/rust/modbus-mqtt/target,sharing=locked \
     --mount=type=cache,target=/usr/local/cargo/registry,sharing=locked \
-    cargo build --release --offline && mv target/release/modbus-mqtt ./bin
+    cargo build --release && mv target/release/modbus-mqtt ./bin
 
 # Now, we need to build our _real_ Docker container, copying in `bump-api`.
 FROM debian:bullseye-slim