Guide for running hs-airdrop in networkless Docker

src/guides/hs-airdrop-docker.md

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+## How to run pseudo-airgapped hs-airdrop using Docker
+
+First, create this `Dockerfile` in an empty directory:
+
+```Dockerfile
+FROM node
+
+RUN git clone https://github.com/handshake-org/hs-airdrop.git /hs-airdrop
+WORKDIR /hs-airdrop
+RUN yarn
+RUN mkdir -p /root/.hs-tree-data/nonces
+RUN curl -Lo /root/.hs-tree-data/tree.bin https://github.com/handshake-org/hs-tree-data/raw/master/tree.bin
+RUN curl -Lo /root/.hs-tree-data/faucet.bin https://github.com/handshake-org/hs-tree-data/raw/master/faucet.bin
+RUN curl -Lo /root/.hs-tree-data/proof.json https://github.com/handshake-org/hs-tree-data/raw/master/proof.json
+RUN curl -Lo /root/.hs-tree-data/nonces/172.bin https://github.com/handshake-org/hs-tree-data/raw/master/nonces/172.bin
+```
+
+Open a terminal, change to that directory, and run the following commands:
+
+```bash
+mkdir keys
+cp ~/.ssh/id_rsa ~/.ssh/id_rsa.pub keys
+# Change the password on your SSH key
+ssh-keygen -p -f keys/id_rsa
+
+docker build -t hs-airdrop .
+
+docker run --rm -it --network none --name no-net --volume=$(pwd)/keys:/ssh hs-airdrop bash
+```
+
+You'll now be running a non-networked container. This is not as secure as it
+could be if you properly air-gapped, but it's better than nothing. Inside the
+container you can check there's no network connectivity:
+
+```bash
+ping 8.8.8.8
+```
+
+Should give an error - so you know there's no internet. Now run the hs-airdrop
+command:
+
+```bash
+./bin/hs-airdrop /ssh/id_rsa <YOUR_WALLET_ADDRESS> 0.010
+```
+
+(0.010 is the mining fee recommended by namebase.io)
+
+You'll probably get an error about not being able to fetch the nonce; this is
+likely because bucket `172` above is incorrect for you - take a note of the
+nonce number in the "Downloading..." URL. Exit the docker bash shell, edit the
+Dockerfile above to contain the correct bucket number (in BOTH PLACES on that
+final line), then run again:
+
+```bash
+docker build -t hs-airdrop .
+
+docker run --rm -it --network none --name no-net --volume=$(pwd)/keys:/ssh hs-airdrop bash
+```
+
+Issue the `./bin/hs-airdrop` command again and hopefully this time it will work.