diff --git a/.github/workflows/purge-cache.yml b/.github/workflows/purge-cache.yml
new file mode 100644
index 00000000000..b78c2cae160
--- /dev/null
+++ b/.github/workflows/purge-cache.yml
@@ -0,0 +1,63 @@
+name: Purge caches
+on:
+  schedule:
+    # 4:10 UTC Sunday
+    - cron: "10 4 * * 0"
+
+  workflow_dispatch:
+
+jobs:
+  cleanup:
+    runs-on: ubuntu-latest
+    permissions:
+      actions: write
+    steps:
+      - name: Purge Cache
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          gh extension install actions/gh-actions-cache
+
+          REPO=${{ github.repository }}
+
+          echo "Fetching list of cache key"
+          allCaches=$(gh actions-cache list -L 100 -R $REPO | cut -f 1 )
+
+          ## Setting this to not fail the workflow while deleting cache keys.
+          set +e
+          echo "Deleting caches..."
+          for cacheKey in $allCaches
+          do
+              gh actions-cache delete $cacheKey -R $REPO --confirm
+          done
+          echo "Done"
+
+  run-test-files:
+    name: Run test-files
+    needs:
+      - cleanup
+    uses: ./.github/workflows/test-files.yml
+
+  run-test-linux:
+    name: Run test-linux
+    needs:
+      - cleanup
+    uses: ./.github/workflows/test-linux.yml
+
+  run-test-mac:
+    name: Run test-mac
+    needs:
+      - cleanup
+    uses: ./.github/workflows/test-mac.yml
+
+  run-test-remoteclient:
+    name: Run test-remoteclient
+    needs:
+      - cleanup
+    uses: ./.github/workflows/test-remoteclient.yml
+
+  run-test-win:
+    name: Run test-win
+    needs:
+      - cleanup
+    uses: ./.github/workflows/test-win.yml
diff --git a/.github/workflows/test-files.yml b/.github/workflows/test-files.yml
index 7fb41afdccc..5e3bb9ce692 100644
--- a/.github/workflows/test-files.yml
+++ b/.github/workflows/test-files.yml
@@ -17,6 +17,7 @@ on:
       - '!installers-conda/**'
       - '!.github/workflows/installers-conda.yml'
       - '!.github/workflows/build-subrepos.yml'
+      - '!.github/workflows/purge-cache.yml'
 
   pull_request:
     branches:
@@ -34,6 +35,9 @@ on:
       - '!installers-conda/**'
       - '!.github/workflows/installers-conda.yml'
       - '!.github/workflows/build-subrepos.yml'
+      - '!.github/workflows/purge-cache.yml'
+
+  workflow_call:
 
   workflow_dispatch:
 
diff --git a/.github/workflows/test-linux.yml b/.github/workflows/test-linux.yml
index 17fbf99e2c6..165d19f24ed 100644
--- a/.github/workflows/test-linux.yml
+++ b/.github/workflows/test-linux.yml
@@ -17,6 +17,7 @@ on:
       - '!installers-conda/**'
       - '!.github/workflows/installers-conda.yml'
       - '!.github/workflows/build-subrepos.yml'
+      - '!.github/workflows/purge-cache.yml'
 
   pull_request:
     branches:
@@ -34,6 +35,9 @@ on:
       - '!installers-conda/**'
       - '!.github/workflows/installers-conda.yml'
       - '!.github/workflows/build-subrepos.yml'
+      - '!.github/workflows/purge-cache.yml'
+
+  workflow_call:
 
   workflow_dispatch:
     inputs:
diff --git a/.github/workflows/test-mac.yml b/.github/workflows/test-mac.yml
index ff283d444ed..4764baf9cd7 100644
--- a/.github/workflows/test-mac.yml
+++ b/.github/workflows/test-mac.yml
@@ -17,6 +17,7 @@ on:
       - '!installers-conda/**'
       - '!.github/workflows/installers-conda.yml'
       - '!.github/workflows/build-subrepos.yml'
+      - '!.github/workflows/purge-cache.yml'
 
   pull_request:
     branches:
@@ -34,6 +35,9 @@ on:
       - '!installers-conda/**'
       - '!.github/workflows/installers-conda.yml'
       - '!.github/workflows/build-subrepos.yml'
+      - '!.github/workflows/purge-cache.yml'
+
+  workflow_call:
 
   workflow_dispatch:
     inputs:
diff --git a/.github/workflows/test-remoteclient.yml b/.github/workflows/test-remoteclient.yml
index 9ea06d22643..8bf93755dda 100644
--- a/.github/workflows/test-remoteclient.yml
+++ b/.github/workflows/test-remoteclient.yml
@@ -15,6 +15,7 @@ on:
       - '!installers-conda/**'
       - '!.github/workflows/installers-conda.yml'
       - '!.github/workflows/build-subrepos.yml'
+      - '!.github/workflows/purge-cache.yml'
 
   pull_request:
     branches:
@@ -30,11 +31,14 @@ on:
       - '!installers-conda/**'
       - '!.github/workflows/installers-conda.yml'
       - '!.github/workflows/build-subrepos.yml'
+      - '!.github/workflows/purge-cache.yml'
+
+  workflow_call:
 
   workflow_dispatch:
     inputs:
       ssh:
-        # github_cli: gh workflow run test-linux.yml --ref <branch> -f ssh=true
+        # github_cli: gh workflow run test-remoteclient.yml --ref <branch> -f ssh=true
         description: 'Enable ssh debugging'
         required: false
         default: false
diff --git a/.github/workflows/test-win.yml b/.github/workflows/test-win.yml
index a6f74c8fb57..2a801c630f3 100644
--- a/.github/workflows/test-win.yml
+++ b/.github/workflows/test-win.yml
@@ -17,6 +17,7 @@ on:
       - '!installers-conda/**'
       - '!.github/workflows/installers-conda.yml'
       - '!.github/workflows/build-subrepos.yml'
+      - '!.github/workflows/purge-cache.yml'
 
   pull_request:
     branches:
@@ -34,6 +35,9 @@ on:
       - '!installers-conda/**'
       - '!.github/workflows/installers-conda.yml'
       - '!.github/workflows/build-subrepos.yml'
+      - '!.github/workflows/purge-cache.yml'
+
+  workflow_call:
 
   workflow_dispatch:
     inputs: