Try make target

.drone.yml

@@ -2,15 +2,10 @@ kind: pipeline
 name: amd64
 
 steps:
-  - name: qemu
-    image: plugins/download
-    source: https://github.com/multiarch/qemu-user-static/releases/download/v2.9.1-1/x86_64_qemu-x86_64-static.tar.gz
-
-  - name: prep
+  - name: Get qemu
     image: busybox
     commands:
-      - tar -xvf x86_64_qemu-x86_64-static.tar.gz
-      - rm x86_64_qemu-x86_64-static.tar.gz
+      - make build/qemu-x86_64-static
 
   - name: build
     image: plugins/docker
@@ -28,6 +23,11 @@ kind: pipeline
 name: arm
 
 steps:
+  - name: Get qemu
+    image: busybox
+    commands:
+      - make build/qemu-arm-static
+
   - name: build
     image: plugins/docker
     settings:

Dockerfile

@@ -2,18 +2,9 @@ ARG REPO=library
 FROM ${REPO}/python:3-alpine
 
 ARG ARCH=x86_64
-ARG HOST_ARCH=x86_64
 
-ARG QEMU_VERSION=v2.9.1-1
-
-RUN [ $ARCH == $HOST_ARCH ] || { \
-             wget https://github.com/multiarch/qemu-user-static/releases/download/${QEMU_VERSION}/${HOST_ARCH}_qemu-${ARCH}-static.tar.gz && \
-             tar -xvf ${HOST_ARCH}_qemu-${ARCH}-static.tar.gz && \
-             rm ${HOST_ARCH}_qemu-${ARCH}-static.tar.gz && \
-             mv qemu-${ARCH}-static /usr/bin/ ; \
-             }
+COPY ./build/qemu-${ARCH}-static /usr/bin/
 
 RUN echo "OK" > /foo
 
-
 CMD [ "cat", "/foo" ]