feat: add initial nilchain-devnet docker image

.dockerignore

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+/.git
+/.github

.github/workflows/docker.yml

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+name: Build and push docker image
+
+on:
+  workflow_dispatch:
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: nilchain-devnet
+
+jobs:
+  docker-build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v4
+        with:
+          images: ${{ env.REGISTRY }}/NillionNetwork/${{ env.IMAGE_NAME }}
+          tags: |
+            type=ref,event=branch
+            type=ref,event=tag
+          flavor: |
+            latest=false  # Ensure 'latest' tag is not generated
+
+      - name: Set VERSION environment variable
+        run: |
+          # Extract the first tag from the generated tags
+          TAG=$(echo ${{ steps.meta.outputs.tags }} | cut -d ',' -f 1)
+          TAG=$(echo $TAG | cut -d ':' -f 2)
+          echo "VERSION=$TAG" >> $GITHUB_ENV
+
+      - name: Build Docker image
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          tags: ${{ steps.meta.outputs.tags }}
+          build-args: |
+            VERSION=${{ env.VERSION }}
+
+      - name: Debug tags
+        run: |
+          echo "Generated tags: ${{ steps.meta.outputs.tags }}"
+          echo "Generated labels: ${{ steps.meta.outputs.labels }}"
+
+      - name: List Docker images
+        run: docker images
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@v2
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Push Docker image
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          build-args: |
+            VERSION=${{ env.VERSION }}

.github/workflows/merge.yaml

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+name: Build image
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+
+jobs:
+  docker-build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Build Docker image
+        uses: docker/build-push-action@v2
+        id: build
+
+      - name: Test image is runnable
+        run: |
+          docker run --rm ${{steps.build.outputs.imageid}} config view app
+
+

Dockerfile

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+FROM ghcr.io/nillionnetwork/nilchaind:v0.2.5
+
+WORKDIR /opt/nilchain
+
+COPY config config
+COPY data data
+
+EXPOSE 26648 26649 26650
+
+ENTRYPOINT ["nilchaind", "--home", "/opt/nilchain"]
+CMD ["start"]

README.md

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 # nilchain-devnet
-A preconfigured nilchain docker image to run as a local devnet
+
+A preconfigured single node nilchain docker image to be used as a local devnet for testing purposes.
+
+## Ports
+
+The nilchain instance can be reached at the following ports:
+
+| Protocol | Port  |
+|----------|-------|
+| JSON RPC | 26648 |
+| gRPC     | 26649 |
+| REST     | 26650 |
+
+## Stash account
+
+There's a single "stash" account that contains lots of funds using private key 
+`97f49889fceed88a9cdddb16a161d13f6a12307c2b39163f3c3c397c3c2d2434`.
+
+## Overriding configurations
+
+Configurations can be overridden by using an environment variable named like:
+
+```bash
+NILCHAIND_${CONFIG_FILE_SECTION}_${VARIABLE}
+```
+
+For example, one can change the commit timeout by running the container like this:
+
+```bash
+docker run --rm -e NILCHAIND_CONSENSUS_TIMEOUT_COMMIT=200ms ghcr.io/nillionnetwork/nilchain-devnet:latest
+```

config/addrbook.json

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+{
+  "key": "2df7e9ed510558a71905f92c",
+  "addrs": []
+}
+

config/app.toml

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+minimum-gas-prices = "0stake"
+query-gas-limit = "0"
+
+[api]
+address = "tcp://0.0.0.0:26650"
+
+[grpc]
+address = "0.0.0.0:26649"
+enable = true
+
+[grpc-web]
+enable = true
+

config/client.toml

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+chain-id = "nillion-chain-devnet"
+keyring-backend = "test"
+node = "tcp://localhost:26657"
+broadcast-mode = "sync"

config/config.toml

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+[consensus]
+create_empty_blocks = true
+create_empty_blocks_interval = "5s"
+skip_timeout_commit = false
+timeout_commit = "1s"
+
+[rpc]
+laddr = "tcp://0.0.0.0:26648"