Stellar explorer with Stellar quickstart for developers

[chatch]

For Stellar developers ensure compatibility with Stellar Quickstart (https://github.com/stellar/quickstart).

This will allow devs to view transactions in their local network with Stellar Explorer running in a docker container.

Connects to:

• horizon at http://localhost:8000
• soroban-rpc at http://localhost:8000/soroban/rpc

Public the image to ghcr.io.

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Get working with the testing` image and with soroban enabled:

docker run --rm -it -p "8000:8000" --name stellar stellar/quickstart:testing --local --enable-soroban-rpc

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done - no changes required after restoring the custom network feature.

just click "Set Custom Network" in the top right - add the local addresses in the description above if testing with quickstart. you can now explore the local quickstart network.