use docker stage to fetch qemu

.github/workflows/dockerarm.yml

@@ -5,11 +5,5 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@master
-      - name: prepare stuff
-        run: docker run --rm --privileged multiarch/qemu-user-static:arm --reset -p yes
-
-      - name: test stuff
-        run: docker run --rm -t arm32v6/alpine uname -m
-
       - name: Build the Docker image
         run: docker build . --file 0.18/source/Dockerfile --tag bitcoind:arm-$(date +%s)

0.18/source/Dockerfile

@@ -1,5 +1,13 @@
+FROM alpine:3.10 AS downloader
+
+RUN wget --quiet -O /qemu-arm-static \
+    https://github.com/multiarch/qemu-user-static/releases/download/v4.0.0-2/qemu-arm-static ;\
+    chmod +x /qemu-arm-static
+
 # Build stage for Bitcoin Core
-FROM arm32v6/alpine:3.9 AS bitcoin-core
+FROM arm32v7/alpine:3.10 AS bitcoin-core
+
+COPY --from=downloader /qemu-arm-static  /usr/bin/qemu-arm-static
 
 # fetch already built berkeleydb
 COPY --from=lncm/berkeleydb:db-4.8.30.NC-linux-arm /opt /opt
@@ -84,7 +92,9 @@ RUN strip ${BITCOIN_PREFIX}/lib/libbitcoinconsensus.so.0.0.0
 
 
 # Build stage for compiled artifacts
-FROM arm32v6/alpine:3.9 AS final
+FROM arm32v7/alpine:3.10 AS final
+
+COPY --from=downloader /qemu-arm-static  /usr/bin/qemu-arm-static
 
 LABEL maintainer.0="nolim1t (@nolim1t)" \
       maintainer.1="Damian Mee (@meeDamian)"