Edit to reflect changes in docker on celestia-node #1913

[jcstein]

Error building this when testing celestia-node v0.8.0-rc1, needs to be updated to reflect celestiaorg/celestia-node#1913

docker build . -t celestia-local-devnet

[+] Building 0.5s (8/11)
 => [internal] load build definition from Dockerfile                    0.0s
 => => transferring dockerfile: 32B                                     0.0s
 => [internal] load .dockerignore                                       0.0s
 => => transferring context: 2B                                         0.0s
 => [internal] load metadata for ghcr.io/celestiaorg/celestia-app:v0.1  0.4s
 => [internal] load metadata for ghcr.io/celestiaorg/celestia-node:v0.  0.4s
 => CACHED [celestia-node 1/1] FROM ghcr.io/celestiaorg/celestia-node:  0.0s
 => [stage-1 1/5] FROM ghcr.io/celestiaorg/celestia-app:v0.12.1@sha256  0.0s
 => CANCELED [internal] load build context                              0.0s
 => => transferring context:                                            0.0s
 => ERROR [stage-1 2/5] COPY --from=celestia-node /celestia /           0.0s
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 > [stage-1 2/5] COPY --from=celestia-node /celestia /:
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ERROR: failed to solve: failed to compute cache key: "/celestia" not found: not found