Add pixi configuration for local dev

.gitattributes

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+# GitHub syntax highlighting
+pixi.lock linguist-language=YAML linguist-generated=true

.github/workflows/test.yml

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+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+  merge_group:
+
+jobs:
+  default:
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, macos-13]
+    runs-on: ${{ matrix.os }}
+    name: Build on ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: prefix-dev/setup-pixi@v0.8.0
+        with:
+          pixi-version: v0.38.0
+          cache: true
+          cache-write: ${{ github.event_name == 'push' && github.ref_name == 'main' }}
+
+      - run: pixi run ci
+
+      - run: "./build/fulgor | grep 'Fulgor: a colored de Bruijn graph index'"
+        name: check

.gitignore

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 build
 debug_build
 test_data
-.idea
+.idea
+
+.pixi