PromptKit/Dockerfile.demo at main · AltairaLabs/PromptKit · GitHub

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# Dockerfile for recording demos with promptarena
# Supports: VHS (GIF), asciinema (.cast)
#
# Usage:
#   make demo-build          # Build container
#   make demo-run            # Interactive shell
#   make demo-vhs-docker     # Record all VHS tapes
#
# Or manually:
#   docker build -t promptarena-demo -f Dockerfile.demo .
#   docker run -it --rm \
#     -v $(pwd)/examples:/demo \
#     -v $(pwd)/recordings:/recordings \
#     --env-file .env.demo \
#     promptarena-demo
#
# Inside container:
#   vhs /recordings/tapes/01-install.tape   # Record single tape
#   record-all                               # Record all tapes
#   asciinema rec /recordings/my-demo.cast  # Interactive recording
#
# NOTE: API keys are passed via --env-file and never appear in recordings

FROM golang:1.26-alpine

# Install dependencies, fonts, and VHS in a single layer
# - System packages and tools
# - JetBrains Mono Nerd Font for terminal icons
# - Noto Color Emoji for full emoji support in Chromium
# - VHS (Charmbracelet) for GIF recording
RUN apk add --no-cache \
    bash \
    bash-completion \
    chromium \
    curl \
    ffmpeg \
    font-jetbrains-mono \
    font-noto-emoji \
    fontconfig \
    git \
    ncurses \
    nodejs \
    npm \
    py3-pip \
    python3 \
    ttyd \
    && pip3 install --break-system-packages asciinema \
    && fc-cache -f \
    # Install JetBrains Mono Nerd Font for icons in terminal recordings
    && mkdir -p /usr/share/fonts/nerd-fonts \
    && curl -fsSL https://github.com/ryanoasis/nerd-fonts/releases/download/v3.3.0/JetBrainsMono.tar.xz \
    | tar -xJ -C /usr/share/fonts/nerd-fonts \
    && curl -fsSL https://github.com/googlefonts/noto-emoji/raw/main/fonts/NotoColorEmoji.ttf \
    -o /usr/share/fonts/nerd-fonts/NotoColorEmoji.ttf \
    && fc-cache -f \
    # Install VHS (Charmbracelet) for GIF recording
    && curl -fsSL https://github.com/charmbracelet/vhs/releases/download/v0.10.0/vhs_0.10.0_Linux_x86_64.tar.gz \
    | tar -xz --strip-components=1 -C /usr/local/bin vhs_0.10.0_Linux_x86_64/vhs \
    && chmod +x /usr/local/bin/vhs

# Set clean, minimal prompt (just colored $)
ENV PS1='\[\e[35m\]$\[\e[0m\] '
ENV TERM=xterm-256color
ENV COLORTERM=truecolor

# Disable shell history for clean recordings
ENV HISTFILE=/dev/null

# VHS uses chromium for rendering
ENV CHROME_PATH=/usr/bin/chromium-browser
ENV VHS_NO_SANDBOX=true

# Copy promptarena binary (built for linux/amd64)
# Build with: GOOS=linux GOARCH=amd64 go build -o bin/promptarena-linux ./tools/arena
COPY bin/promptarena-linux /usr/local/bin/promptarena

# Copy packc binary (built for linux/amd64)
# Build with: GOOS=linux GOARCH=amd64 go build -o bin/packc-linux ./tools/packc
COPY bin/packc-linux /usr/local/bin/packc

# Set up shell environment:
# - Disable terminal bell (audible and visible)
# - Create env-safe wrapper to filter API keys from output
# - Configure bash completions for login shells
# - Add record-all helper script for VHS
# Note: Alpine sources /etc/profile.d/*.sh for login shells
RUN echo 'set bell-style none' >> /etc/inputrc && \
    echo '#!/bin/bash\n/usr/bin/env "$@" | grep -v "_API_KEY\|_SECRET\|_TOKEN"' > /usr/local/bin/env-safe && \
    chmod +x /usr/local/bin/env-safe && \
    chmod +x /usr/local/bin/promptarena && \
    chmod +x /usr/local/bin/packc && \
    mkdir -p /etc/bash_completion.d /recordings/gifs && \
    promptarena completion bash > /etc/bash_completion.d/promptarena && \
    packc completion bash > /etc/bash_completion.d/packc && \
    echo '#!/bin/bash' > /etc/profile.d/completions.sh && \
    echo '[ -f /usr/share/bash-completion/bash_completion ] && \
        source /usr/share/bash-completion/bash_completion' \
        >> /etc/profile.d/completions.sh && \
    echo 'source /etc/bash_completion.d/promptarena' >> /etc/profile.d/completions.sh && \
    echo 'source /etc/bash_completion.d/packc' >> /etc/profile.d/completions.sh && \
    chmod +x /etc/profile.d/completions.sh && \
    echo '#!/bin/bash' > /usr/local/bin/record-all && \
    echo 'echo "Recording all VHS tapes..."' >> /usr/local/bin/record-all && \
    echo 'for tape in /recordings/tapes/*.tape; do' >> /usr/local/bin/record-all && \
    echo '  echo "Recording $tape..."' >> /usr/local/bin/record-all && \
    echo '  vhs "$tape" || echo "Failed: $tape"' >> /usr/local/bin/record-all && \
    echo 'done' >> /usr/local/bin/record-all && \
    echo 'echo "Done! GIFs saved to /recordings/gifs/"' >> /usr/local/bin/record-all && \
    chmod +x /usr/local/bin/record-all

# Copy local Go modules so SDK demos use local code instead of fetching from internet
COPY go.work /promptkit/go.work
COPY sdk /promptkit/sdk
COPY runtime /promptkit/runtime
COPY pkg /promptkit/pkg

# Set working directory
WORKDIR /demo

# Default shell
CMD ["bash"]