Attempt to see if this resolves build slowness

.cargo/config.toml

@@ -8,3 +8,6 @@
 
 [target.aarch64-unknown-linux-musl]
 rustflags = ["-Clinker=rust-lld"]
+
+[target.aarch64-unknown-linux-gnu]
+linker = "aarch64-linux-gnu-gcc"

.dockerignore

@@ -0,0 +1,3 @@
+Dockerfile
+*.md
+.github/**

Dockerfile

@@ -9,7 +9,9 @@ RUN \
   DEBIAN_FRONTEND=noninteractive \
   apt-get update && \
   apt-get -y install ca-certificates tzdata && \
-  if [ "${TARGETPLATFORM}" = "linux/arm64" ]; then apt install -y g++-aarch64-linux-gnu; fi;
+  if [ "${TARGETPLATFORM}" = "linux/arm64" ]; then \
+      apt install -y g++-aarch64-linux-gnu; \
+  fi;
 
 ENV CARGO_NET_GIT_FETCH_WITH_CLI=true
 
@@ -22,6 +24,8 @@ RUN if [ "${TARGETPLATFORM}" = "linux/arm64" ]; then \
         cargo build --release; \
     fi
 
+RUN ls -l target/release
+
 # https://hub.docker.com/r/bitnami/minideb
 FROM bitnami/minideb:latest AS final
 
@@ -41,7 +45,7 @@ COPY --from=build \
 
 # copy built executable
 COPY --from=build \
-  /app/target/release/microbin \
+  /app/target/*/microbin \
   /usr/bin/microbin
 
 # Expose webport used for the webserver to the docker runtime