Vendor: replace dep with go modules

.gitignore

@@ -1,2 +1,4 @@
+.vscode
 bin
-coverage.out
+coverage.out
+release/

Dockerfile

@@ -1,15 +1,10 @@
 # Build Stage
-FROM golang:alpine AS build-stage
+FROM golang:1.12 AS build-stage
 
-LABEL app="build-prometheus-es-adapter"
-LABEL REPO="https://github.com/pwillie/prometheus-es-adapter"
-
-RUN apk add -U -q --no-progress make git
-
-ADD . /go/src/github.com/pwillie/prometheus-es-adapter
-WORKDIR /go/src/github.com/pwillie/prometheus-es-adapter
+WORKDIR /src
+ADD . .
 
-RUN make build-alpine
+RUN make test && make build
 
 # Final Stage
 FROM alpine:latest
@@ -18,7 +13,7 @@ ENV USERID 789
 ENV USERNAME pesa
 
 RUN addgroup -g ${USERID} -S ${USERNAME} \
- && adduser -u ${USERID} -G ${USERNAME} -S ${USERNAME}
+  && adduser -u ${USERID} -G ${USERNAME} -S ${USERNAME}
 
 ARG GIT_COMMIT
 ARG VERSION
@@ -28,7 +23,7 @@ LABEL VERSION=$VERSION
 
 RUN apk add -U ca-certificates
 
-COPY --from=build-stage /go/src/github.com/pwillie/prometheus-es-adapter/bin/prometheus-es-adapter /usr/local/bin/
+COPY --from=build-stage /src/release/linux/amd64/prometheus-es-adapter /usr/local/bin/
 
 USER ${USERNAME}