Fix lint warnings inside Dockerfiles

Author: IvanGoncharov

example/express-server/Dockerfile

@@ -8,9 +8,8 @@ COPY ./graphql-voyager-*.tgz graphql-voyager.tgz
 
 COPY ./example/express-server ./example/express-server
 
-WORKDIR example/express-server
-RUN npm install
-RUN npm test
+WORKDIR /app/example/express-server
+RUN npm install && npm test
 
 EXPOSE  9090
-CMD npm start
+CMD ["npm", "start"]

example/webpack/Dockerfile

@@ -1,16 +1,15 @@
 # syntax=docker/dockerfile:1
 
-FROM node:20
+FROM node:24
 
 WORKDIR /app
 
 COPY ./graphql-voyager-*.tgz graphql-voyager.tgz
 
 COPY ./example/webpack ./example/webpack
 
-WORKDIR example/webpack
-RUN npm install
-RUN npm test
+WORKDIR /app/example/webpack
+RUN npm install && npm test
 
 EXPOSE  9090
-CMD npm start
+CMD ["npm", "start"]

worker/Dockerfile

@@ -6,39 +6,41 @@ ENV GRAPHVIZ_VERSION=8.0.1
 ENV EXPAT_VERSION=2.5.0
 ENV USE_CLOSURE=0
 
+# Since bellow RUN commands use pipes set "pipefail"
+SHELL ["/bin/bash", "-o", "pipefail", "-c"]
+
 WORKDIR /home/build/deps
 
 RUN EXPAT_SOURCE_URL="https://github.com/libexpat/libexpat/releases/download/R_$(echo ${EXPAT_VERSION} | tr . _)/expat-${EXPAT_VERSION}.tar.xz"; \
     curl --fail --location "$EXPAT_SOURCE_URL" | tar -xJ
-RUN mv expat-${EXPAT_VERSION} expat
-WORKDIR expat
-RUN	grep -q ${EXPAT_VERSION} expat_config.h
+RUN mv expat-${EXPAT_VERSION} expat \
+    && grep -q ${EXPAT_VERSION} expat/expat_config.h
+WORKDIR /home/build/deps/expat
 RUN emconfigure ./configure \
     --disable-shared \
     --prefix=/home/build \
     --libdir=/home/build/lib \
-    CFLAGS="-Oz -w -flto" LDFLAGS="-Oz -s -flto"
-RUN emmake make -j -C lib all install
-WORKDIR ..
+    CFLAGS="-Oz -w -flto" LDFLAGS="-Oz -s -flto" \
+    && emmake make -j -C lib all install
+WORKDIR /home/build/deps
 
 RUN GRAPHVIZ_SOURCE_URL="https://gitlab.com/api/v4/projects/4207231/packages/generic/graphviz-releases/${GRAPHVIZ_VERSION}/graphviz-${GRAPHVIZ_VERSION}.tar.xz"; \
     curl --fail --location "$GRAPHVIZ_SOURCE_URL" | tar -xJ
-RUN mv "graphviz-${GRAPHVIZ_VERSION}" graphviz
-WORKDIR graphviz
-RUN grep -q "${GRAPHVIZ_VERSION}" graphviz_version.h
+RUN mv "graphviz-${GRAPHVIZ_VERSION}" graphviz \
+    && grep -q "${GRAPHVIZ_VERSION}" graphviz/graphviz_version.h
+WORKDIR /home/build/deps/graphviz
 RUN emconfigure ./configure \
     --without-sfdp \
     --disable-ltdl \
     --enable-static \
     --disable-shared \
     --prefix=/home/build \
     --libdir=/home/build/lib \
-    CFLAGS="-Oz -w -flto" LDFLAGS="-Oz -s -flto"
-
-RUN emmake make -j lib plugin
-RUN emmake make -j -C lib install
-RUN emmake make -j -C plugin install
-WORKDIR ..
+    CFLAGS="-Oz -w -flto" LDFLAGS="-Oz -s -flto" \
+    && emmake make -j lib plugin \
+    && emmake make -j -C lib install \
+    && emmake make -j -C plugin install
+WORKDIR /home/build/deps
 
 WORKDIR /home