chore(examples): switch default from yarn to npm in Dockerfiles (#61348)

## Changes

- Switch default package manager to npm
- Fixes #61293

Closes NEXT-2291

examples/with-docker-compose/next-app/dev.Dockerfile

@@ -7,7 +7,7 @@ COPY package.json yarn.lock* package-lock.json* pnpm-lock.yaml* ./
 RUN \
   if [ -f yarn.lock ]; then yarn --frozen-lockfile; \
   elif [ -f package-lock.json ]; then npm ci; \
-  elif [ -f pnpm-lock.yaml ]; then yarn global add pnpm && pnpm i; \
+  elif [ -f pnpm-lock.yaml ]; then corepack enable pnpm && pnpm i; \
   # Allow install without lockfile, so example works even without Node.js installed locally
   else echo "Warning: Lockfile not found. It is recommended to commit lockfiles to version control." && yarn install; \
   fi
@@ -28,5 +28,5 @@ CMD \
   if [ -f yarn.lock ]; then yarn dev; \
   elif [ -f package-lock.json ]; then npm run dev; \
   elif [ -f pnpm-lock.yaml ]; then pnpm dev; \
-  else yarn dev; \
+  else npm run dev; \
   fi

examples/with-docker-compose/next-app/prod-without-multistage.Dockerfile

@@ -8,7 +8,7 @@ COPY package.json yarn.lock* package-lock.json* pnpm-lock.yaml* ./
 RUN \
   if [ -f yarn.lock ]; then yarn --frozen-lockfile; \
   elif [ -f package-lock.json ]; then npm ci; \
-  elif [ -f pnpm-lock.yaml ]; then yarn global add pnpm && pnpm i; \
+  elif [ -f pnpm-lock.yaml ]; then corepack enable pnpm && pnpm i; \
   # Allow install without lockfile, so example works even without Node.js installed locally
   else echo "Warning: Lockfile not found. It is recommended to commit lockfiles to version control." && yarn install; \
   fi
@@ -36,13 +36,13 @@ RUN \
   if [ -f yarn.lock ]; then yarn build; \
   elif [ -f package-lock.json ]; then npm run build; \
   elif [ -f pnpm-lock.yaml ]; then pnpm build; \
-  else yarn build; \
+  else npm run build; \
   fi
 
 # Start Next.js based on the preferred package manager
 CMD \
   if [ -f yarn.lock ]; then yarn start; \
   elif [ -f package-lock.json ]; then npm run start; \
   elif [ -f pnpm-lock.yaml ]; then pnpm start; \
-  else yarn start; \
+  else npm run start; \
   fi

examples/with-docker-compose/next-app/prod.Dockerfile

@@ -11,7 +11,7 @@ COPY package.json yarn.lock* package-lock.json* pnpm-lock.yaml* ./
 RUN \
   if [ -f yarn.lock ]; then yarn --frozen-lockfile; \
   elif [ -f package-lock.json ]; then npm ci; \
-  elif [ -f pnpm-lock.yaml ]; then yarn global add pnpm && pnpm i; \
+  elif [ -f pnpm-lock.yaml ]; then corepack enable pnpm && pnpm i; \
   # Allow install without lockfile, so example works even without Node.js installed locally
   else echo "Warning: Lockfile not found. It is recommended to commit lockfiles to version control." && yarn install; \
   fi
@@ -37,7 +37,7 @@ RUN \
   if [ -f yarn.lock ]; then yarn build; \
   elif [ -f package-lock.json ]; then npm run build; \
   elif [ -f pnpm-lock.yaml ]; then pnpm build; \
-  else yarn build; \
+  else npm run build; \
   fi
 
 # Note: It is not necessary to add an intermediate step that does a full copy of `node_modules` here

examples/with-docker-multi-env/docker/development/Dockerfile

@@ -12,7 +12,7 @@ COPY package.json yarn.lock* package-lock.json* pnpm-lock.yaml* ./
 RUN \
   if [ -f yarn.lock ]; then yarn --frozen-lockfile; \
   elif [ -f package-lock.json ]; then npm ci; \
-  elif [ -f pnpm-lock.yaml ]; then yarn global add pnpm && pnpm i; \
+  elif [ -f pnpm-lock.yaml ]; then corepack enable pnpm && pnpm i; \
   else echo "Lockfile not found." && exit 1; \
   fi
 
@@ -23,7 +23,7 @@ COPY --from=deps /app/node_modules ./node_modules
 COPY . .
 # This will do the trick, use the corresponding env file for each environment.
 COPY .env.development.sample .env.production
-RUN yarn build
+RUN npm run build
 
 # 3. Production image, copy all the files and run next
 FROM base AS runner

examples/with-docker-multi-env/docker/production/Dockerfile

@@ -12,7 +12,7 @@ COPY package.json yarn.lock* package-lock.json* pnpm-lock.yaml* ./
 RUN \
   if [ -f yarn.lock ]; then yarn --frozen-lockfile; \
   elif [ -f package-lock.json ]; then npm ci; \
-  elif [ -f pnpm-lock.yaml ]; then yarn global add pnpm && pnpm i; \
+  elif [ -f pnpm-lock.yaml ]; then corepack enable pnpm && pnpm i; \
   else echo "Lockfile not found." && exit 1; \
   fi
 
@@ -24,7 +24,7 @@ COPY --from=deps /app/node_modules ./node_modules
 COPY . .
 # This will do the trick, use the corresponding env file for each environment.
 COPY .env.production.sample .env.production
-RUN yarn build
+RUN npm run build
 
 # 3. Production image, copy all the files and run next
 FROM base AS runner

examples/with-docker-multi-env/docker/staging/Dockerfile

@@ -12,7 +12,7 @@ COPY package.json yarn.lock* package-lock.json* pnpm-lock.yaml* ./
 RUN \
   if [ -f yarn.lock ]; then yarn --frozen-lockfile; \
   elif [ -f package-lock.json ]; then npm ci; \
-  elif [ -f pnpm-lock.yaml ]; then yarn global add pnpm && pnpm i; \
+  elif [ -f pnpm-lock.yaml ]; then corepack enable pnpm && pnpm i; \
   else echo "Lockfile not found." && exit 1; \
   fi
 
@@ -24,7 +24,7 @@ COPY --from=deps /app/node_modules ./node_modules
 COPY . .
 # This will do the trick, use the corresponding env file for each environment.
 COPY .env.staging.sample .env.production
-RUN yarn build
+RUN npm run build
 
 # 3. Production image, copy all the files and run next
 FROM base AS runner

examples/with-docker/Dockerfile

@@ -11,7 +11,7 @@ COPY package.json yarn.lock* package-lock.json* pnpm-lock.yaml* ./
 RUN \
   if [ -f yarn.lock ]; then yarn --frozen-lockfile; \
   elif [ -f package-lock.json ]; then npm ci; \
-  elif [ -f pnpm-lock.yaml ]; then yarn global add pnpm && pnpm i --frozen-lockfile; \
+  elif [ -f pnpm-lock.yaml ]; then corepack enable pnpm && pnpm i --frozen-lockfile; \
   else echo "Lockfile not found." && exit 1; \
   fi
 
@@ -27,7 +27,7 @@ COPY . .
 # Uncomment the following line in case you want to disable telemetry during the build.
 # ENV NEXT_TELEMETRY_DISABLED 1
 
-RUN yarn build
+RUN npm run build
 
 # If using npm comment out above and use below instead
 # RUN npm run build