Modernize rain.cli: rainix bump, drop submodule, DCL + REUSE, rainix reusables, Cachix publish

.github/workflows/legal.yaml

@@ -0,0 +1,5 @@
+name: legal
+on: [push]
+jobs:
+  legal:
+    uses: rainlanguage/rainix/.github/workflows/rainix-sol-legal.yaml@main

.github/workflows/nix-build.yaml

@@ -0,0 +1,32 @@
+name: nix-build
+on: [push]
+jobs:
+  nix-build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+      - uses: nixbuild/nix-quick-install-action@v30
+        with:
+          nix_conf: |
+            keep-env-derivations = true
+            keep-outputs = true
+      # Push the freshly-built `.#rain` derivation to the rainlanguage Cachix
+      # cache so downstream consumers (e.g. `nix shell
+      # github:rainlanguage/rain.cli`) hit the cache instead of recompiling.
+      # continue-on-error lets a missing token / cache outage degrade to a
+      # normal build.
+      - uses: cachix/cachix-action@v15
+        continue-on-error: true
+        with:
+          name: rainlanguage
+          authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}
+          # No store-watching daemon: it checkpoints the nix DB concurrently
+          # with cache-nix-action and corrupts it. Push happens in the post step.
+          useDaemon: false
+      - name: Restore and save Nix store
+        uses: nix-community/cache-nix-action@v7
+        with:
+          primary-key: nix-${{ runner.os }}-${{ hashFiles('**/*.nix', '**/flake.lock') }}
+          restore-prefixes-first-match: nix-${{ runner.os }}-
+          gc-max-store-size-linux: 8G
+      - run: nix build .#rain --print-build-logs

.github/workflows/package-release.yaml

@@ -0,0 +1,14 @@
+name: Package Release
+on:
+  push:
+    branches:
+      - main
+jobs:
+  release:
+    # Bump + publish rain_cli to crates.io on every push to main, preserving
+    # the existing alpha-pre-release cadence.
+    uses: rainlanguage/rainix/.github/workflows/rainix-autopublish.yaml@main
+    with:
+      crate: rain_cli
+      level: alpha
+    secrets: inherit

.github/workflows/rs-static.yaml

@@ -0,0 +1,5 @@
+name: rs-static
+on: [push]
+jobs:
+  rs-static:
+    uses: rainlanguage/rainix/.github/workflows/rainix-rs-static.yaml@main

.github/workflows/rs-test.yaml

@@ -0,0 +1,5 @@
+name: rs-test
+on: [push]
+jobs:
+  rs-test:
+    uses: rainlanguage/rainix/.github/workflows/rainix-rs-test.yaml@main

.gitignore

@@ -1,3 +1,4 @@
 target
 result
-lib
+lib
+.pre-commit-config.yaml