Add Dockerfile and workflow to build

nyx-chain-watcher/Dockerfile

@@ -0,0 +1,32 @@
+FROM rust:latest AS builder
+
+COPY ./ /usr/src/nym
+WORKDIR /usr/src/nym/nyx-chain-watcher
+
+RUN cargo build --release
+
+#-------------------------------------------------------------------
+# The following environment variables are required at runtime:
+#
+# NYX_CHAIN_WATCHER_DATABASE_PATH = /mnt/nyx-chain-watchter.sqlite
+# NYX_CHAIN_WATCHER_HISTORY_DATABASE_PATH = /mnt/chain-history.sqlite
+# NYX_CHAIN_WATCHER_WATCH_ACCOUNTS = "n1...,n1...,n1..."
+#
+# And optionally:
+#
+# NYX_CHAIN_WATCHER_WATCH_CHAIN_MESSAGE_TYPES = "/cosmos.bank.v1beta1.MsgSend,/ibc.applications.transfer.v1.MsgTransfer"
+# NYX_CHAIN_WATCHER_CONFIG_ENV_FILE_ARG = /mnt/sandbox.env for sandbox environment
+#
+# see https://github.com/nymtech/nym/blob/develop/nyx-chain-watcher/src/cli/commands/run/args.rs for details
+# and https://github.com/nymtech/nym/blob/develop/nyx-chain-watcher/src/env.rs for env vars
+#-------------------------------------------------------------------
+
+FROM ubuntu:24.04
+
+RUN apt update && apt install -yy curl ca-certificates
+
+WORKDIR /nym
+
+COPY --from=builder /usr/src/nym/target/release/nyx-chain-watcher ./
+ENTRYPOINT [ "/nym/nyx-chain-watcher" ]
+