Merge branch 'master' into aliu/free

Author: plp127

.devcontainer/Dockerfile

@@ -1,8 +1,6 @@
-FROM mcr.microsoft.com/devcontainers/base:jammy
+FROM mcr.microsoft.com/devcontainers/base:ubuntu
 
 USER vscode
 WORKDIR /home/vscode
 
 RUN curl https://elan.lean-lang.org/elan-init.sh -sSf | sh -s -- -y --default-toolchain none
-
-ENV PATH="/home/vscode/.elan/bin:${PATH}"

.devcontainer/devcontainer.json

@@ -1,17 +1,20 @@
 {
   "name": "Mathlib4 dev container",
 
-  "image": "ghcr.io/leanprover-community/mathlib4/gitpod",
+  "build": {
+    "dockerfile": "Dockerfile"
+  },
 
   "onCreateCommand": "lake exe cache get!",
 
   "hostRequirements": {
-     "cpus": 4
+    "cpus": 4,
+    "memory": "8gb"
   },
 
   "customizations": {
-    "vscode" : {
-      "extensions" : [ "leanprover.lean4" ]
+    "vscode": {
+      "extensions": ["leanprover.lean4"]
     }
   }
 }

.docker/gitpod-blueprint/Dockerfile

@@ -10,7 +10,7 @@ FROM ubuntu:jammy
 USER root
 
 ENV DEBIAN_FRONTEND=noninteractive
-RUN apt-get update && apt-get install sudo git curl git bash-completion texlive texlive-xetex latexmk graphviz graphviz-dev python3 python3-pip python3-requests -y && apt-get clean
+RUN apt-get update && apt-get install sudo git curl git bash-completion texlive texlive-xetex latexmk graphviz graphviz-dev tzdata python3 python3-pip python3-requests -y && apt-get clean
 
 RUN useradd -l -u 33333 -G sudo -md /home/gitpod -s /bin/bash -p gitpod gitpod \
     # passwordless sudo for users in the 'sudo' group

.docker/gitpod/Dockerfile

@@ -9,7 +9,7 @@ FROM ubuntu:jammy
 USER root
 
 ENV DEBIAN_FRONTEND=noninteractive
-RUN apt-get update && apt-get install sudo git curl git bash-completion python3 python3-pip python3-requests -y && apt-get clean
+RUN apt-get update && apt-get install sudo git curl git tzdata bash-completion python3 python3-pip python3-requests -y && apt-get clean
 
 RUN useradd -l -u 33333 -G sudo -md /home/gitpod -s /bin/bash -p gitpod gitpod \
     # passwordless sudo for users in the 'sudo' group

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,8 +1,11 @@
 
 ---
-<!-- The text above the `---` will become the commit message when your
-PR is merged. Please leave a blank newline before the `---`, otherwise
-GitHub will format the text above it as a title.
+<!-- Your PR title will become the first line of the commit message.
+
+In this box, the text above the `---` (if not empty) will be appended
+to the commit message, and can be used to give additional context or
+details. Please leave a blank newline before the `---`, otherwise GitHub
+will format the text above it as a title.
 
 For details on the "pull request lifecycle" in mathlib, please see:
 https://leanprover-community.github.io/contribute/index.html

.github/actionlint.yml

@@ -3,3 +3,4 @@ self-hosted-runner:
     - bors
     - pr
     - doc-gen
+    - lean4checker

.github/actions/get-mathlib-ci/README.md

@@ -0,0 +1,74 @@
+# get-mathlib-ci
+
+This action is the source of truth for how workflows in this repository check out
+`leanprover-community/mathlib-ci`.
+
+## Policy
+
+Any workflow that needs `mathlib-ci` should use this action instead of writing its
+own `actions/checkout` block for `leanprover-community/mathlib-ci`.
+
+The default `ref` in [`action.yml`](./action.yml) is the single canonical pinned
+`mathlib-ci` commit for this repository.
+
+## Why
+
+- Keep the pinned `mathlib-ci` ref in one place.
+- Avoid drift and copy/paste mistakes across many workflows.
+- Make ref bumps a one-file update.
+
+## Usage
+
+In workflows, check out this repository's actions from the running workflow commit,
+then use the local action:
+
+```yaml
+- name: Checkout local actions
+  uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+  with:
+    ref: ${{ github.workflow_sha }}
+    fetch-depth: 1
+    sparse-checkout: .github/actions
+    path: workflow-actions
+
+- name: Get mathlib-ci
+  uses: ./workflow-actions/.github/actions/get-mathlib-ci
+```
+
+Override the ref only when needed:
+
+```yaml
+- name: Get mathlib-ci
+  uses: ./workflow-actions/.github/actions/get-mathlib-ci
+  with:
+    ref: master
+```
+
+## Outputs
+
+This action also exposes values that later workflow steps can reuse:
+
+- `ref`: the effective `mathlib-ci` ref that was checked out. If the workflow did
+  not pass `with.ref`, this is the action's default pinned commit.
+- `path`: the checkout path used for `mathlib-ci`.
+- `scripts_dir`: the absolute path to the checked out `scripts` directory.
+
+The action also exports these environment variables for subsequent steps:
+
+- `CI_CHECKOUT_PATH`: the absolute path to the checked out `mathlib-ci` repository.
+- `CI_SCRIPTS_DIR`: the absolute path to the checked out `mathlib-ci/scripts` directory.
+
+If a workflow needs to refer to the exact resolved `mathlib-ci` ref later, use the
+action output instead of duplicating the pinned SHA in the workflow:
+
+```yaml
+- name: Get mathlib-ci
+  id: get_mathlib_ci
+  uses: ./workflow-actions/.github/actions/get-mathlib-ci
+
+- name: Use resolved ref
+  run: |
+    echo "Resolved ref: ${{ steps.get_mathlib_ci.outputs.ref }}"
+    echo "Scripts dir: ${{ steps.get_mathlib_ci.outputs.scripts_dir }}"
+    echo "Raw URL: https://raw.githubusercontent.com/leanprover-community/mathlib-ci/${{ steps.get_mathlib_ci.outputs.ref }}/scripts/nightly/create-adaptation-pr.sh"
+```

.github/actions/get-mathlib-ci/action.yml

@@ -0,0 +1,51 @@
+# Source of truth for `mathlib-ci` checkout settings in this repository.
+# Workflows should use this action instead of duplicating the checkout block
+# and hardcoded ref in multiple places.
+name: Get mathlib-ci
+description: Checkout leanprover-community/mathlib-ci at a shared ref.
+inputs:
+  ref:
+    description: Git ref (branch, tag, or SHA) for mathlib-ci.
+    required: false
+    # Default pinned commit used by workflows unless they explicitly override.
+    # Update this ref as needed to pick up changes to mathlib-ci scripts
+    default: 261ca4c0c6bd3267e4846ef9fdd676afab9fef4e
+  path:
+    description: Checkout destination path.
+    required: false
+    default: ci-tools
+  fetch-depth:
+    description: Number of commits to fetch.
+    required: false
+    default: '1'
+outputs:
+  ref:
+    description: Effective ref used for the checkout.
+    value: ${{ inputs.ref }}
+  path:
+    description: Checkout path used.
+    value: ${{ inputs.path }}
+  scripts_dir:
+    description: Absolute path to the scripts directory.
+    value: ${{ steps.paths.outputs.scripts_dir }}
+runs:
+  using: composite
+  steps:
+    - name: Get mathlib-ci
+      uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      with:
+        repository: leanprover-community/mathlib-ci
+        ref: ${{ inputs.ref }}
+        fetch-depth: ${{ inputs.fetch-depth }}
+        path: ${{ inputs.path }}
+
+    - name: Setup CI Scripts Paths
+      id: paths
+      shell: bash
+      run: |
+        checkout_path="${GITHUB_WORKSPACE}/${{ inputs.path }}"
+        scripts_dir="${checkout_path}/scripts"
+        echo "checkout_path=${checkout_path}" >> "$GITHUB_OUTPUT"
+        echo "scripts_dir=${scripts_dir}" >> "$GITHUB_OUTPUT"
+        echo "CI_CHECKOUT_PATH=${checkout_path}" >> "$GITHUB_ENV"
+        echo "CI_SCRIPTS_DIR=${scripts_dir}" >> "$GITHUB_ENV"