CI: Add reusable workflow to clear caches within a repository

.github/actions/cache/action.yml

@@ -32,12 +32,6 @@ runs:
     run: python .github/assistant.py set-oldest-versions
     shell: bash
 
-  - run: python -c "import time ; days = time.time() / 60 / 60 / 24 ; print(f'TIME_PERIOD={int(days / ${{ inputs.interval }})}')" >> $GITHUB_ENV
-    if: inputs.requires == 'latest'
-    shell: bash
-
-  # Note: This uses an internal pip API and may not always work
-  # https://github.com/actions/cache/blob/master/examples.md#multiple-oss-in-a-workflow
   - name: Determine caches
     env:
       PWD: $(pwd)
@@ -49,13 +43,13 @@ runs:
     uses: actions/cache@v3
     with:
       path: $PIP_CACHE_DIR
-      key: ${{ runner.os }}-py${{ inputs.python-version }}-pip-td${{ env.TIME_PERIOD }}-${{ inputs.offset }}-${{ hashFiles('requirements.txt') }}
-      restore-keys: ${{ runner.os }}-py${{ inputs.python-version }}-pip-td${{ env.TIME_PERIOD }}-${{ inputs.offset }}-
+      key: ${{ runner.os }}-py${{ inputs.python-version }}-pip-${{ inputs.offset }}-${{ hashFiles('requirements.txt') }}
+      restore-keys: ${{ runner.os }}-py${{ inputs.python-version }}-pip-${{ inputs.offset }}-
 
   - name: Cache conda
     uses: actions/cache@v3
     if: runner.os == 'Linux'
     with:
       path: ~/conda_pkgs_dir
-      key: py${{ inputs.python-version }}-conda-td${{ env.TIME_PERIOD }}-${{ inputs.offset }}
-      restore-keys: py${{ inputs.python-version }}-conda-td${{ env.TIME_PERIOD }}-${{ inputs.offset }}
+      key: py${{ inputs.python-version }}-conda-${{ inputs.offset }}
+      restore-keys: py${{ inputs.python-version }}-conda-${{ inputs.offset }}

.github/workflows/clear-cache.yml

@@ -0,0 +1,39 @@
+name: Clear cache flow
+
+on:
+  workflow_call:
+    inputs:
+      pattern:
+        description: 'string to grep cache keys with'
+        required: true
+        type: string
+
+jobs:
+  clear-cache:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Get the list of cache keys
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          gh api -H "Accept: application/vnd.github+json" /repos/${{ github.repository }}/actions/caches --paginate --jq ".actions_caches[].key" | sort | uniq > cache_keys.txt && cat cache_keys.txt || echo "no cache keys found with the pattern"
+
+      - name: Filter cache keys
+        run: |
+          grep -E ${{ inputs.pattern }} cache_keys.txt > cache_keys_to_remove.txt && cat cache_keys_to_remove.txt || echo "no cache keys found with the pattern"
+
+      - name: Remove caches
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          echo created_at last_accessed_at ref key size_in_bytes
+          for key in $(cat cache_keys_to_remove.txt); do
+            gh api --method DELETE -H "Accept: application/vnd.github+json" "/repos/${{ github.repository }}/actions/caches?key=${key}" --jq '.actions_caches[] | [.created_at, .last_accessed_at, .ref, .key, .size_in_bytes] | join(" ")'
+          done
+
+      - name: Show the list of remaining caches
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          gh api -H "Accept: application/vnd.github+json" /repos/${{ github.repository }}/actions/caches --paginate --jq ".actions_caches[].key" | sort | uniq

.github/workflows/schedule-clear-cache.yml

@@ -0,0 +1,13 @@
+name: Clear cache weekly
+
+on:
+  schedule:
+    # on Sundays
+    - cron: "0 0 * * 0"
+
+jobs:
+  clear-cache:
+    if: ${{ github.repository_owner == 'Lightning-AI' }}
+    uses: ./.github/workflows/clear-cache.yml
+    with:
+      pattern: 'pip|conda'