fix: Dockerfile build $BUILDPLATFORM

use the $BUILDPLATFORM env instead of hardcoding it, rename platform.sh to target.sh

containerised/Dockerfile

@@ -2,7 +2,7 @@
 ## Builder ##
 #############
 
-FROM --platform=linux/amd64 rust:slim AS builder
+FROM --platform=$BUILDPLATFORM rust:slim AS builder
 
 ARG TARGETARCH
 
@@ -11,9 +11,9 @@ ENV CARGO_TARGET_AARCH64_UNKNOWN_LINUX_MUSL_LINKER="aarch64-linux-gnu-gcc"
 ENV CARGO_TARGET_AARCH64_UNKNOWN_LINUX_MUSL_RUSTFLAGS="-C target-feature=+crt-static -C link-arg=-lgcc"
 ENV CARGO_TARGET_ARM_UNKNOWN_LINUX_MUSLEABIHF_LINKER="arm-linux-gnueabihf-ld"
 
-COPY ./containerised/platform.sh .
+COPY ./containerised/target.sh .
 
-RUN chmod +x ./platform.sh && ./platform.sh
+RUN chmod +x ./target.sh && ./target.sh
 
 RUN apt-get update && apt-get install $(cat /.compiler) -y
 
@@ -29,10 +29,10 @@ COPY Cargo.* /usr/src/havn/
 WORKDIR /usr/src/havn
 
 # Install target platform (Cross-Compilation)
-RUN rustup target add $(cat /.platform)
+RUN rustup target add $(cat /.target)
 
 # This is a dummy build to get the dependencies cached - probably not needed - as run via a github action
-RUN cargo build --target $(cat /.platform) --release
+RUN cargo build --target $(cat /.target) --release
 
 # Now copy in the rest of the sources
 COPY src /usr/src/havn/src/
@@ -41,9 +41,9 @@ COPY src /usr/src/havn/src/
 RUN touch /usr/src/havn/src/main.rs
 
 # This is the actual application build
-RUN cargo build --release --target $(cat /.platform)
+RUN cargo build --release --target $(cat /.target)
 
-RUN cp /usr/src/havn/target/$(cat /.platform)/release/havn /
+RUN cp /usr/src/havn/target/$(cat /.target)/release/havn /
 
 #############
 ## Runtime ##

containerised/platform.sh → containerised/target.sh

@@ -4,15 +4,15 @@
 case $TARGETARCH in
 
 "amd64")
-	echo "x86_64-unknown-linux-musl" >/.platform
+	echo "x86_64-unknown-linux-musl" >/.target
 	echo "" >/.compiler
 	;;
 "arm64")
-	echo "aarch64-unknown-linux-musl" >/.platform
+	echo "aarch64-unknown-linux-musl" >/.target
 	echo "gcc-aarch64-linux-gnu" >/.compiler
 	;;
 "arm")
-	echo "arm-unknown-linux-musleabihf" >/.platform
+	echo "arm-unknown-linux-musleabihf" >/.target
 	echo "gcc-arm-linux-gnueabihf" >/.compiler
 	;;
 esac