fix(js-sdk): strip quotes from ENV values in fromDockerfile()

[beran-t]

Summary

fromDockerfile() parses ENV instructions but stores values as raw strings without stripping quotes. This causes ENV GOPATH="/go" to produce "/go" (with literal quote characters) instead of /go.

Variable expansion (e.g. ${GOPATH}) is handled by the backend, so the SDK only needs to strip quotes.

Changes

• Add stripQuotes() helper — removes surrounding " or ' from ENV values
• Apply stripQuotes() to all value extraction points in handleEnvInstruction()
• Add unit tests for quote stripping behavior

Before/After (tested)

Test	Input	Output
strips double quotes	ENV GOPATH="/go"	/go
strips single quotes	ENV GOPATH='/go'	/go
does not strip mismatched quotes	ENV GOPATH="/go'	"/go' (unchanged)
handles unquoted values	ENV GOPATH=/go	/go (unchanged)
preserves variable references as-is	ENV PATH="/usr/bin:${GOPATH}/bin"	/usr/bin:${GOPATH}/bin
strips quotes from multiple pairs	ENV A="hello" B="world"	hello, world
ARG with default value	ARG MY_ARG="hello"	hello
ARG without default	ARG MY_ARG	""

Only packages/js-sdk/src/template/dockerfileParser.ts is modified (+97/-4 lines).

Test plan

• Unit tests for quote stripping (double, single, mismatched, unquoted, multi-pair)
• Integration build test: Dockerfile with ENV GOPATH="/go" + RUN test "$GOPATH" = "/go" — build succeeded, confirming quotes are stripped and backend expands variables
• Existing fromDockerfile.test.ts tests pass
• pnpm run format, pnpm run lint, pnpm run typecheck all pass

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[github-actions]

Package Artifacts

Built from 32c7d9a. Download artifacts from this workflow run.

JS SDK (e2b@2.14.2-fix-env-quote-stripping.0):

npm install ./e2b-2.14.2-fix-env-quote-stripping.0.tgz

CLI (@e2b/cli@2.8.1-fix-env-quote-stripping.0):

npm install ./e2b-cli-2.8.1-fix-env-quote-stripping.0.tgz

Python SDK (e2b==2.15.1+fix-env-quote-stripping):

pip install ./e2b-2.15.1+fix.env.quote.stripping-py3-none-any.whl

[mishushakov]

@claude does it need to be changed in Python as well?