Move downloading gomplate to separate stage

Signed-off-by: m.nabokikh <maksim.nabokikh@flant.com>

Dockerfile

@@ -20,14 +20,7 @@ COPY . .
 
 RUN make release-binary
 
-FROM alpine:3.13.1
-
-# Dex connectors, such as GitHub and Google logins require root certificates.
-# Proper installations should manage those certificates, but it's a bad user
-# experience when this doesn't work out of the box.
-#
-# OpenSSL is required so wget can query HTTPS endpoints for health checking.
-RUN apk add --no-cache --update ca-certificates openssl
+FROM alpine:3.13.1 AS gomplate
 
 ARG TARGETOS
 ARG TARGETARCH
@@ -38,6 +31,16 @@ RUN wget -O /usr/local/bin/gomplate \
   "https://github.com/hairyhenderson/gomplate/releases/download/${GOMPLATE_VERSION}/gomplate_${TARGETOS:-linux}-${TARGETARCH:-amd64}${TARGETVARIANT}" \
   && chmod +x /usr/local/bin/gomplate
 
+
+FROM alpine:3.13.1
+
+# Dex connectors, such as GitHub and Google logins require root certificates.
+# Proper installations should manage those certificates, but it's a bad user
+# experience when this doesn't work out of the box.
+#
+# OpenSSL is required so wget can query HTTPS endpoints for health checking.
+RUN apk add --no-cache --update ca-certificates openssl
+
 RUN mkdir -p /var/dex
 RUN chown -R 1001:1001 /var/dex
 
@@ -50,6 +53,7 @@ COPY --from=builder /usr/local/src/dex/go.mod /usr/local/src/dex/go.sum /usr/loc
 COPY --from=builder /usr/local/src/dex/api/v2/go.mod /usr/local/src/dex/api/v2/go.sum /usr/local/src/dex/api/v2/
 
 COPY --from=builder /go/bin/dex /usr/local/bin/dex
+COPY --from=gomplate /usr/local/bin/gomplate /usr/local/bin/gomplate
 
 USER 1001:1001
 

docker-entrypoint.sh

@@ -9,7 +9,6 @@ case "$command" in
       if test -f "$file_candidate"; then
         tmpfile=$(mktemp /tmp/dex.config.yaml-XXXXXX)
         gomplate -f "$file_candidate" -o "$tmpfile"
-        echo "config rendered successfully into the tmp file ${tmpfile}"
 
         args="${args} ${tmpfile}"
       else