remove drill and internal healthcheck

Dockerfile

@@ -7,7 +7,7 @@ ARG DNSCRYPT_PROXY_URL=https://github.com/DNSCrypt/dnscrypt-proxy/archive/
 
 ENV CGO_ENABLED 0
 
-RUN apk add --no-cache ca-certificates=20190108-r0 curl=7.66.0-r0 drill=1.7.0-r2 \
+RUN apk add --no-cache ca-certificates=20190108-r0 curl=7.66.0-r0 \
 	&& curl -L "${DNSCRYPT_PROXY_URL}${DNSCRYPT_PROXY_VERSION}.tar.gz" -o /tmp/dnscrypt-proxy.tar.gz \
 	&& tar xzf /tmp/dnscrypt-proxy.tar.gz --strip 1 -C /go/src/github.com/DNSCrypt \
 	&& go build -v -ldflags="-s -w" \
@@ -43,17 +43,8 @@ COPY --from=build /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
 COPY --from=build /go/src/github.com/DNSCrypt/dnscrypt-proxy/dnscrypt-proxy /usr/local/bin/
 COPY --from=build --chown=nonroot /config /config
 
-COPY --from=build /usr/bin/drill /usr/bin/drill
-COPY --from=build /usr/lib/libldns.so.2 /usr/lib/libldns.so.2.0.0 /usr/lib/libcrypto.so.1.1 /usr/lib/
-COPY --from=build /lib/libcrypto.so.1.1 /lib/ld-musl-*.so.1 /lib/libc.musl-*.so.1 /lib/
-
 USER nonroot
 
 ENTRYPOINT ["dnscrypt-proxy", "-config", "/config/dnscrypt-proxy.toml"]
 
-HEALTHCHECK --interval=30s --timeout=30s --start-period=5s --retries=3 \
-	CMD [ "drill", "-p", "5053", "dnscrypt.info", "@127.0.0.1" ]
-
 RUN ["dnscrypt-proxy", "-version"]
-
-RUN ["drill", "-v"]

test/docker-compose.yml

@@ -4,6 +4,6 @@ services:
         image: klutchell/dnscrypt-proxy
     dig:
         image: alpine:3.10
-        command: sh -c 'apk add -q --no-cache drill=1.7.0-r2 && drill -p 5053 dnscrypt.info @dnscrypt-proxy'
+        command: sh -c 'apk add -q --no-cache drill=1.7.0-r2 && drill -p 5053 dnscrypt.info @dnscrypt-proxy | tee /dev/stderr | grep -q NOERROR'
         links:
             - dnscrypt-proxy