Restructure repo

.envrc

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+use flake

.github/workflows/ci-nix.yaml

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+name: "CI"
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+on:
+  merge_group:
+  push:
+    branches:
+    - master
+    - release
+  pull_request:
+
+permissions:
+  checks: write
+  pull-requests: write
+
+jobs:
+  build-test:
+    name: "Build & test"
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: 📥 Checkout repository
+      uses: actions/checkout@v4
+
+    - name: ❄ Prepare nix
+      uses: cachix/install-nix-action@v30
+      with:
+        extra_nix_config: |
+          accept-flake-config = true
+          log-lines = 1000
+
+    - name: ❄ Cachix cache of nix derivations
+      uses: cachix/cachix-action@v15
+      with:
+        name: cardano-scaling
+        authToken: '${{ secrets.CACHIX_CARDANO_SCALING_AUTH_TOKEN }}'
+
+    - name: ❓ Build and test
+      run: |
+        nix run .#apps.x86_64-linux.hydra-explorer -- --help
+
+        # Note: The tests need to find `json-schemas/hydra-explorer-api.yaml`;
+        # so they need to be run in this specific folder.
+        cd hydra-explorer
+
+        # We need the packages in the shell to run the tests
+        nix develop -c cabal update
+        nix develop -c cabal test all

.gitignore

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+dist-newstyle
+result*
+
+test-results.xml
+hspec-results.md
+
+.pre-commit-config.yaml

README.md

@@ -1,16 +1,18 @@
-# Hydra Explorer
+# hydra-explorer
 
-A small executable which connects to a chain like the `hydra-node`, but puts any
-observations as traces onto `stdout`.
+This is the system image repository for the hydra-explorer service.
 
-To run, pass a `--node-socket` and the corresponding network id. For example:
+## Deployment
 
-``` shell
-hydra-explorer \
-  --node-socket testnets/preprod/node.socket \
-  --testnet-magic 1
+```sh
+nix run .#apps.x86_64-linux.nixinate.hydra-explorer
 ```
 
-Note: this assumes you are running a cardano-node in preprod.
+## Testing locally
 
-By definition, hydra-explorer will bind port 9090.
+```sh
+nix build .#qemu
+cp result/nixos.qcow2 .
+chmod 755 nixos.qcow2
+qemu-system-x86_64 -enable-kvm -m 8000 -drive file=nixos.qcow2,media=disk,if=virtio -nic user,model=virtio
+```

cabal.project

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+repository cardano-haskell-packages
+  url: https://chap.intersectmbo.org/
+  secure: True
+  root-keys:
+    3e0cce471cf09815f930210f7827266fd09045445d65923e6d0238a6cd15126f
+    443abb7fb497a134c343faf52f0b659bd7999bc06b7f63fa76dc99d631f9bea1
+    a86a1f6ce86c449c46666bda44268677abf29b5b2d2eb5ec7af903ec2f117a82
+    bcec67e8e99cabfa7764d75ad9b158d72bfacf70ca1d0ec8bc6b4406d1bf8413
+    c00aae8461a256275598500ea0e187588c35a5d5d7454fb57eac18d9edb86a56
+    d4a35cd3121aa00d18544bb0ac01c3e1691d618f462c46129271bccf39f7e8ee
+
+index-state:
+  , hackage.haskell.org 2024-10-14T02:12:15Z
+  , cardano-haskell-packages 2024-10-14T23:19:53Z
+
+packages:
+  hydra-explorer
+
+source-repository-package
+  type: git
+  location: https://github.com/cardano-scaling/hydra
+  tag: d55c4efb896273dc39d4bdc4fc83ec361de55f73
+  --sha256: sha256-LziIjrdjMA8dVPKMwKskLyjlnx5HhpDwTjC9sek5Bfo=
+  subdir:
+    hydra-cardano-api
+    hydra-chain-observer
+    hydra-cluster
+    hydra-node 
+    hydra-plutus
+    hydra-plutus-extras
+    hydra-prelude
+    hydra-test-utils
+    hydra-tx