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Add example for jit-compiled snapshot #2208

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29 changes: 29 additions & 0 deletions dart/README.md
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Expand Up @@ -115,6 +115,35 @@ EXPOSE 8080
CMD ["/app/bin/server"]
```

You can also compile a jit snapshot with the following Dockerfile:
```Dockerfile
# Specify the Dart SDK base image version using dart:<version> (ex: dart:2.12)
FROM dart:stable AS build

# Resolve app dependencies.
WORKDIR /app
COPY pubspec.* ./
RUN dart pub get

# Copy app source code and JIT compile it.
COPY . .
# Ensure packages are still up-to-date if anything has changed
RUN dart pub get --offline
RUN dart compile jit-snapshot bin/server.dart

# Build minimal serving image from JIT-snaphot-compiled `/server.jit` and required system
# libraries and configuration files stored in `/runtime/` from the build stage.
# Also copies over the dart binary.
FROM scratch
COPY --from=build /runtime/ /
COPY --from=build /app/bin/server.jit app/bin/
COPY --from=build /usr/lib/dart/bin/dart /usr/bin/

# Start server.
EXPOSE 8080
ENTRYPOINT ["dart", "/app/bin/server.jit"]
```

### `.dockerignore`

Additionally it creates a recommended `.dockerignore` file, which enumarates files that should be omitted from the built Docker image:
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