Add E2B.

backend/container/e2b.Dockerfile

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+# e2b template build --name "terminal"
+
+# Use a Debian-based base image
+FROM ubuntu:22.04
+
+# Install dependencies and customize sandbox
+RUN apt update \
+    && apt install -y sudo
+
+# Install xterm
+RUN apt update \
+    && apt install -y xterm
+
+RUN apt update \
+    && apt install -y tmux screen
+
+# Clean up
+RUN apt clean \
+    && rm -rf /var/lib/apt/lists/*

backend/container/e2b.toml

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+# This is a config for E2B sandbox template.
+# You can use 'template_id' (ne8xtb57tq5xw9vwhdyc) or 'template_name (terminal) from this config to spawn a sandbox:
+
+# Python SDK
+# from e2b import Sandbox
+# sandbox = Sandbox(template='terminal')
+
+# JS SDK
+# import { Sandbox } from 'e2b'
+# const sandbox = await Sandbox.create({ template: 'terminal' })
+
+dockerfile = "e2b.Dockerfile"
+template_name = "terminal"
+template_id = "ne8xtb57tq5xw9vwhdyc"