Merge branch 'develop' into random_bugs

Author: tobiasdiez

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,32 +1,26 @@
-<!-- ^^^^^
-Please provide a concise, informative and self-explanatory title.
-Don't put issue numbers in there, do this in the PR body below.
-For example, instead of "Fixes #1234" use "Introduce new method to calculate 1+1"
--->
-<!-- Describe your changes here in detail -->
+<!-- ^ Please provide a concise and informative title. -->
+<!-- ^ Don't put issue numbers in the title, do this in the PR description below. -->
+<!-- ^ For example, instead of "Fixes #12345" use "Introduce new method to calculate 1 + 2". -->
+<!-- v Describe your changes below in detail. -->
+<!-- v Why is this change required? What problem does it solve? -->
+<!-- v If this PR resolves an open issue, please link to it here. For example, "Fixes #12345". -->
+
 
-<!-- Why is this change required? What problem does it solve? -->
-<!-- If this PR resolves an open issue, please link to it here. For example "Fixes #12345". -->
-<!-- If your change requires a documentation PR, please link it appropriately. -->
 
 ### :memo: Checklist
 
 <!-- Put an `x` in all the boxes that apply. -->
-<!-- If your change requires a documentation PR, please link it appropriately -->
-<!-- If you're unsure about any of these, don't hesitate to ask. We're here to help! -->
-<!-- Feel free to remove irrelevant items. -->
 
-- [ ] The title is concise, informative, and self-explanatory.
+- [ ] The title is concise and informative.
 - [ ] The description explains in detail what this PR is about.
 - [ ] I have linked a relevant issue or discussion.
 - [ ] I have created tests covering the changes.
 - [ ] I have updated the documentation accordingly.
 
 ### :hourglass: Dependencies
 
-<!-- List all open PRs that this PR logically depends on
-- #12345: short description why this is a dependency
-- #34567: ...
--->
+<!-- List all open PRs that this PR logically depends on. For example, -->
+<!-- - #12345: short description why this is a dependency -->
+<!-- - #34567: ... -->
+
 
-<!-- If you're unsure about any of these, don't hesitate to ask. We're here to help! -->

.github/workflows/ci-conda.yml

@@ -22,11 +22,26 @@ jobs:
 
     strategy:
       matrix:
-        os: [ubuntu, macos]
-        python: ['3.9', '3.10', '3.11']
+        # On pushes to tags or branches, test the whole matrix.
+        os: >-
+          ${{ github.event_name == 'pull_request'
+                && fromJson('["ubuntu"]')
+                || fromJson('["ubuntu", "macos"]') }}
+        python: >-
+          ${{ github.event_name == 'pull_request'
+                && fromJson('["3.9"]')
+                || fromJson('["3.9", "3.10", "3.11"]') }}
         # Optional environment is disabled for now as its not yet working
         # environment: [environment, environment-optional]
         conda-env: [environment]
+        # On pull requests, only test two jobs:
+        # Ubuntu with Python 3.9, macOS with Python 3.10.
+        # Build & Test currently uses Python 3.11 (on ubuntu-focal).
+        # Together, they cover the supported minor Python versions.
+        include: >-
+          ${{ github.event_name == 'pull_request'
+                && fromJson('[{"os": "macos", "python": "3.10", "conda-env": "environment"}]')
+                || fromJson('[]') }}
 
     steps:
       - uses: actions/checkout@v4