Docker: Do not run apk on non-alpine distros (#83361)

Dockerfile

@@ -40,12 +40,12 @@ ARG GO_BUILD_TAGS="oss"
 ARG WIRE_TAGS="oss"
 ARG BINGO="true"
 
-# This is required to allow building on arm64 due to https://github.com/golang/go/issues/22040
-RUN apk add --no-cache binutils-gold
-
-# Install build dependencies
 RUN if grep -i -q alpine /etc/issue; then \
-      apk add --no-cache gcc g++ make git; \
+      apk add --no-cache \
+          # This is required to allow building on arm64 due to https://github.com/golang/go/issues/22040
+          binutils-gold \
+          # Install build dependencies
+          gcc g++ make git; \
     fi
 
 WORKDIR /tmp/grafana