Add cron job to auto-update pixi lock file (#978)

This way there will be a PR that updates the lock file every month

.github/workflows/core_tests.yml

@@ -1,7 +1,7 @@
 name: Julia Tests
 on:
   push:
-    branches: [main]
+    branches: [main, update/pixi-lock]
     paths-ignore: [".teamcity/**"]
     tags: ["*"]
   pull_request:

.github/workflows/docs.yml

@@ -1,7 +1,7 @@
 name: Docs
 on:
   push:
-    branches: [main]
+    branches: [main, update/pixi-lock]
     paths-ignore: [".teamcity/**"]
   pull_request:
   merge_group:

.github/workflows/pixi_auto_update.yml

@@ -0,0 +1,32 @@
+name: Pixi auto update
+
+on:
+  schedule:
+  # At 03:00 on day 1 of the month
+    - cron: "0 3 1 * *"
+  # on demand
+  workflow_dispatch:
+
+jobs:
+  auto-update:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ssh-key: ${{ secrets.SSH_PRIVATE_KEY }}
+      - uses: prefix-dev/[email protected]
+        with:
+          pixi-version: "latest"
+          cache: false
+      - name: Update pixi lock file
+        run: |
+          rm pixi.lock
+          pixi install
+      - uses: peter-evans/create-pull-request@v5
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          branch: update/pixi-lock
+          title: Update pixi lock file
+          commit-message: "Update `pixi.lock`"
+          body: Update pixi dependencies to the latest version.
+          author: "GitHub <[email protected]>"

.github/workflows/pre-commit_check.yml

@@ -4,7 +4,7 @@ on:
   pull_request:
   merge_group:
   push:
-    branches: [main, update/pre-commit-hooks]
+    branches: [main, update/pre-commit-hooks, update/pixi-lock]
 
 jobs:
   check:

.github/workflows/python_lint.yml

@@ -1,7 +1,7 @@
 name: Python Lint
 on:
   push:
-    branches: [main]
+    branches: [main, update/pixi-lock]
     paths-ignore: [".teamcity/**"]
     tags: ["*"]
   pull_request:

.github/workflows/python_tests.yml

@@ -1,7 +1,7 @@
 name: Ribasim Python Tests
 on:
   push:
-    branches: [main]
+    branches: [main, update/pixi-lock]
     paths-ignore: [".teamcity/**"]
     tags: ["*"]
   pull_request:

.github/workflows/qgis.yml

@@ -2,7 +2,7 @@ name: QGIS Tests
 
 on:
     push:
-      branches: [main]
+      branches: [main, update/pixi-lock]
       paths-ignore: [".teamcity/**"]
       tags: ["*"]
     pull_request: