Docker does not build for Raspberry Pi 64bits

When building the dockerfile, npm throws the following error:

```
Step 12/16 : RUN source /root/.nvm/nvm.sh && npm config set unsafe-perm true && npm install && (cd prerender-server && npm run dist) && DEST=/srv/explorer/static/bitcoin-mainnet npm run dist -- bitcoin-mainnet && DEST=/srv/explorer/static/bitcoin-testnet npm run dist -- bitcoin-testnet && DEST=/srv/explorer/static/bitcoin-regtest npm run dist -- bitcoin-regtest && DEST=/srv/explorer/static/liquid-mainnet npm run dist -- liquid-mainnet && DEST=/srv/explorer/static/liquid-regtest npm run dist -- liquid-regtest && DEST=/srv/explorer/static/bitcoin-mainnet-blockstream npm run dist -- bitcoin-mainnet blockstream && DEST=/srv/explorer/static/bitcoin-testnet-blockstream npm run dist -- bitcoin-testnet blockstream && DEST=/srv/explorer/static/bitcoin-regtest-blockstream npm run dist -- bitcoin-regtest blockstream && DEST=/srv/explorer/static/liquid-mainnet-blockstream npm run dist -- liquid-mainnet blockstream && DEST=/srv/explorer/static/liquid-regtest-blockstream npm run dist -- liquid-regtest blockstream
**---> Running in 579e84a2494a
/root/.nvm/versions/node/v12.16.1/bin/node: 1: /root/.nvm/versions/node/v12.16.1/bin/node:ELF: not found
/root/.nvm/versions/node/v12.16.1/bin/node: 12: /root/.nvm/versions/node/v12.16.1/bin/node: Syntax error: word unexpected (expecting ")")
nvm is not compatible with the npm config "prefix" option: currently set to ""
Run `nvm use --delete-prefix v12.16.1 --silent` to unset it.**
The command '/bin/bash -c source /root/.nvm/nvm.sh && npm config set unsafe-perm true && npm install && (cd prerender-server && npm run dist) && DEST=/srv/explorer/static/bitcoin-mainnet npm run dist -- bitcoin-mainnet && DEST=/srv/explorer/static/bitcoin-testnet npm run dist -- bitcoin-testnet && DEST=/srv/explorer/static/bitcoin-regtest npm run dist -- bitcoin-regtest && DEST=/srv/explorer/static/liquid-mainnet npm run dist -- liquid-mainnet && DEST=/srv/explorer/static/liquid-regtest npm run dist -- liquid-regtest && DEST=/srv/explorer/static/bitcoin-mainnet-blockstream npm run dist -- bitcoin-mainnet blockstream && DEST=/srv/explorer/static/bitcoin-testnet-blockstream npm run dist -- bitcoin-testnet blockstream && DEST=/srv/explorer/static/bitcoin-regtest-blockstream npm run dist -- bitcoin-regtest blockstream && DEST=/srv/explorer/static/liquid-mainnet-blockstream npm run dist -- liquid-mainnet blockstream && DEST=/srv/explorer/static/liquid-regtest-blockstream npm run dist -- liquid-regtest blockstream' returned a non-zero code: 11
```

Isn't there an armv8 version of npm?