currencyservice: bring back multistage build

CHANGELOG.md

@@ -7,6 +7,8 @@ release.
 
 ## Unreleased
 
+* [currencyservice] bring back multistage build
+  ([#1276](https://github.com/open-telemetry/opentelemetry-demo/pull/1276))
 * add env var for pinning trace-based test tool version
   ([#1239](https://github.com/open-telemetry/opentelemetry-demo/pull/1239))
 * update PHP quoteservice to use 1.0.0

src/currencyservice/Dockerfile

@@ -14,22 +14,21 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-FROM alpine
+FROM alpine as builder
 
-RUN apk update
-RUN apk add git cmake make g++ grpc-dev re2-dev protobuf-dev c-ares-dev
+RUN apk update && apk add git cmake make g++ grpc-dev protobuf-dev
 
 ARG OPENTELEMETRY_CPP_VERSION=1.10.0
 
 RUN git clone https://github.com/open-telemetry/opentelemetry-cpp \
-	&& cd opentelemetry-cpp/ \
-    	&& git checkout tags/v${OPENTELEMETRY_CPP_VERSION} -b v${OPENTELEMETRY_CPP_VERSION} \
-	&& mkdir build \
-	&& cd build \
-	&& cmake .. -DCMAKE_CXX_STANDARD=17 -DCMAKE_POSITION_INDEPENDENT_CODE=ON \
-				-DCMAKE_BUILD_TYPE=Release -DBUILD_TESTING=OFF \
-				-DWITH_EXAMPLES=OFF -DWITH_OTLP_GRPC=ON \
-	&& make -j$(nproc || sysctl -n hw.ncpu || echo 1) install && cd ../.. && rm -rf opentelemetry-cpp
+	  && cd opentelemetry-cpp/ \
+    && git checkout tags/v${OPENTELEMETRY_CPP_VERSION} -b v${OPENTELEMETRY_CPP_VERSION} \
+    && mkdir build \
+    && cd build \
+    && cmake .. -DCMAKE_CXX_STANDARD=17 -DCMAKE_POSITION_INDEPENDENT_CODE=ON \
+          -DCMAKE_BUILD_TYPE=Release -DBUILD_TESTING=OFF \
+          -DWITH_EXAMPLES=OFF -DWITH_OTLP_GRPC=ON \
+    && make -j$(nproc || sysctl -n hw.ncpu || echo 1) install && cd ../..
 
 COPY . /currencyservice
 
@@ -38,5 +37,11 @@ RUN cd /currencyservice \
     && cmake .. \
     && make -j$(nproc || sysctl -n hw.ncpu || echo 1) install
 
+
+FROM alpine as release
+
+RUN apk update && apk add grpc-dev protobuf-dev
+COPY --from=builder /usr/local /usr/local
+
 EXPOSE ${CURRENCY_SERVICE_PORT}
 ENTRYPOINT ./usr/local/bin/currencyservice ${CURRENCY_SERVICE_PORT}