fix: error manifest path does not exist when unused

[peterpeterparker]

❯ juno dev build
✔ Build complete at 06:26:24 (version 0.1.0, esbuild 0.25.5)
→ target/deploy/sputnik.index.mjs (0.269 MB)
error: manifest path /juno/src/sputnik/Cargo.toml does not exist

[peterpeterparker]

The root cause of the issue is the build injecting env at build time -> when build in the CI, process.env.CI becomes true