Missing testnet support

[katopz]

refer to https://github.com/jacobcreech/Token-Creator/blob/6e3cb2a2217dc7cb249c01c020840f314b50a3ef/src/components/UploadMetadata.tsx#L10-L13

but it's available here https://docs.bundlr.network/docs/participate/Types%20of%20Nodes/Validator/validator-join#environment-variables

PORT=80
BUNDLER_URL="https://testnet1.bundlr.network"
GW_CONTRACT="<validator contract address>"
GW_ARWEAVE="https://arweave.testnet1.bundlr.network"

so we just miss testnet support or it's really not support?