Try using new crossbuild image

Author: bording

Dockerfile.linux

@@ -1,6 +1,7 @@
+FROM bording/crossbuild
 ARG ARCH='amd64'
-FROM multiarch/ubuntu-core:${ARCH}-focal
-RUN apt update && DEBIAN_FRONTEND=noninteractive apt -y install build-essential cmake pkg-config
+ENV CROSS_TRIPLE=${ARCH}
+RUN apt update && apt -y install pkg-config
 
 WORKDIR /nativebinaries
 COPY . /nativebinaries/