use another method to find the apk

Dockerfile

@@ -95,9 +95,10 @@ WORKDIR /build
 USER builder
 COPY ./src/cron/APKBUILD .
 # generate a RSA key, non-interactive and append to config file, and then build package
+# we use find because the package will end up in an arch specific dir (x86_64, arm, ...)
+# and this way it'll work every time
 # we move it to /build so it's easier to find from the other image
-RUN if [ "$TARGETPLATFORM" = "linux/amd64" ]; then ARCHITECTURE=x86_64; elif [ "$TARGETPLATFORM" = "linux/arm/v7" ]; then ARCHITECTURE=arm; elif [ "$TARGETPLATFORM" = "linux/arm64" ]; then ARCHITECTURE=aarch64; else ARCHITECTURE=x86_64; fi \
-    && abuild-keygen -n -a && abuild && mv /home/builder/packages/$ARCHITECTURE/cronie-$CRONIE_VERSION-r0.apk /build/apk
+RUN abuild-keygen -n -a && abuild && find /home/builder/packages -type f -name '*.apk' -exec mv {} /build/apk \;
 # END CRONIE BUILDER
 
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