Ensure Dockerfile has Linux-only npm packages in lock file. (#69)

The package-lock.json file committed to the repository may lack
Linux-only packages that wouldn't be installed by `npm install` on (say)
macOS. This currently blocks `docker build .` from succeeding. The only
robust solution to this is to allow lock file updatings during the
Docker build.

Signed-off-by: Jacob Howard <[email protected]>

Author: xenoscopic

Dockerfile

@@ -20,7 +20,10 @@ COPY package.json .
 COPY package-lock.json .
 COPY tsconfig.json .
 
-RUN npm ci
+# Refresh the lock file to be sure we include Linux-only packages that might not
+# be in the existing package-lock.json.
+RUN npm install --package-lock-only \
+    && npm ci
 
 COPY src/ ./src/
 
@@ -50,4 +53,4 @@ USER appuser
 ENV NODE_ENV=production
 
 # Command to run the application
-ENTRYPOINT ["node", "dist/index.js"]
+ENTRYPOINT ["node", "dist/index.js"]