build images from 'scratch' (#47)

build docker imaged from the 'scratch' base image this is better security practice and follows the practice of other drone images (like drone-runner-docker)
meltwater · Feb 12, 2021 · d802cdf · d802cdf
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diff --git a/docker/Dockerfile.linux.amd64 b/docker/Dockerfile.linux.amd64
@@ -1,7 +1,7 @@
 FROM alpine:3.10 as alpine
 RUN apk add -U --no-cache ca-certificates
 
-FROM alpine:3.10
+FROM scratch
 EXPOSE 3000
 
 ENV GODEBUG netdns=go

diff --git a/docker/Dockerfile.linux.arm64 b/docker/Dockerfile.linux.arm64
@@ -1,7 +1,7 @@
 FROM alpine:3.10 as alpine
 RUN apk add -U --no-cache ca-certificates
 
-FROM alpine:3.10
+FROM scratch
 EXPOSE 3000
 
 ENV GODEBUG netdns=go