Keep the container image minimal (#557)

* Keep the container image minimal

* Review comment: Changing Integration test dockerfile

* Fix test with Entrypoint

Dockerfile

@@ -18,6 +18,10 @@ RUN apk add --no-cache git make build-base
 ADD . .
 RUN make build
 
+FROM alpine
+
+COPY --from=go_builder /go/src/github.com/openflagr/flagr/flagr .
+
 ENV HOST=0.0.0.0
 ENV PORT=18000
 ENV FLAGR_DB_DBDRIVER=sqlite3
@@ -32,4 +36,5 @@ USER appuser
 ADD --chown=appuser:appgroup ./buildscripts/demo_sqlite3.db /data/demo_sqlite3.db
 
 EXPOSE 18000
-CMD ./flagr
+
+CMD "./flagr"

integration_tests/Dockerfile-Integration-Test

@@ -4,11 +4,16 @@ RUN apk add --no-cache git make build-base
 ADD . .
 RUN make build
 
+FROM alpine
+
+COPY --from=go_builder /go/src/github.com/openflagr/flagr/flagr .
+
 ENV HOST=0.0.0.0
 ENV PORT=18000
 ENV FLAGR_DB_DBDRIVER=sqlite3
 ENV FLAGR_RECORDER_ENABLED=false
 RUN addgroup -S appgroup && adduser -S appuser -G appgroup
 USER appuser
 EXPOSE 18000
-CMD ./flagr
+
+CMD "./flagr"

integration_tests/docker-compose.yml

@@ -2,8 +2,8 @@ version: "3.6"
 
 networks:
   default:
-    external:
-      name: flagr_integration_tests
+    external: true
+    name: flagr_integration_tests
 
 services:
   mysql: