fixing download command (using curl).

docker/Dockerfile

@@ -35,11 +35,11 @@ ENV INFLUXD_CONFIG_PATH=/scrutiny/influxdb
 
 RUN apt-get update && apt-get install -y cron smartmontools=7.0-0ubuntu1~ubuntu18.04.1 ca-certificates curl tzdata \
     && update-ca-certificates \
-    && case ${TARGETARCH} in \
+RUN case ${TARGETARCH} in \
                 "amd64")  S6_ARCH=amd64  ;; \
                 "arm64")  S6_ARCH=aarch64  ;; \
            esac \
-    && wget -q https://github.com/just-containers/s6-overlay/releases/download/v1.21.8.0/s6-overlay-${S6_ARCH}.tar.gz -O /tmp/s6-overlay-${S6_ARCH}.tar.gz \
+    && curl https://github.com/just-containers/s6-overlay/releases/download/v1.21.8.0/s6-overlay-${S6_ARCH}.tar.gz -L -s --output /tmp/s6-overlay-${S6_ARCH}.tar.gz \
     && tar xzf /tmp/s6-overlay-${S6_ARCH}.tar.gz -C /
 
 ADD https://dl.influxdata.com/influxdb/releases/influxdb2-2.2.0-${TARGETARCH}.deb /tmp/