test(perf): allow forced cache refresh, to get fresh AVD snapshot created

this will speed up emulator over time, as we won't use progressively older AVD snapshots
if we can clear them, and the new snapshots have less housekeeping to do after boot

Author: mikehardy

.github/workflows/tests_e2e_android.yml

@@ -1,6 +1,13 @@
 name: Testing E2E Android
 
 on:
+  workflow_dispatch:
+    inputs:
+      clearCaches:
+        description: "Clear workflow caches where possible"
+        required: false
+        type: string
+
   pull_request:
     branches:
       - '**'
@@ -111,10 +118,21 @@ jobs:
           path: |
             ~/.android/avd/*
             ~/.android/adb*
-          key: avd-${{ matrix.api-level }}-${{ matrix.arch }}-${{matrix.target}}-v1-${{ hashFiles('~/.android/avd/**/snapshots/**') }}
+          key: avd-${{ matrix.api-level }}-${{ matrix.arch }}-${{matrix.target}}-v1-${{ github.event.inputs.clearCaches }}
           restore-keys: |
             avd-${{ matrix.api-level }}-${{ matrix.arch }}-${{matrix.target}}-v1
 
+      - name: Clear Caches Optionally
+        if: "${{ github.event.inputs.clearCaches != '' }}"
+        shell: bash
+        run: |
+          du -sk ~/.gradle
+          du -sk ~/.android
+          rm -fr ~/.gradle
+          rm -fr ~/.android
+          du -sk ~/.gradle || echo ~/.gradle is gone
+          du -sk ~/.android || echo ~/.android is gone
+
       - name: Build Android App
         uses: nick-invision/retry@v2
         with:
@@ -146,7 +164,7 @@ jobs:
       - name: AVD Boot and Snapshot Creation
         # Only generate a snapshot with a cache miss
         # Comment the if out to generate snapshots on branch for performance testing
-        if: steps.avd-cache.outputs.cache-hit != 'true'
+        if: "${{ github.event.inputs.clearCaches != '' || (steps.avd-cache.outputs.cache-hit != 'true' && github.ref == 'refs/heads/main') }}"
         uses: reactivecircus/android-emulator-runner@v2
         with:
           api-level: ${{ matrix.api-level }}
@@ -168,7 +186,7 @@ jobs:
         # Only generate a snapshot for saving with a cache miss
         # Switch the if statements via comment if generating snapshots for performance testing
         # if: matrix.first-boot-delay != '0'
-        if: steps.avd-cache.outputs.cache-hit != 'true'
+        if: "${{ github.event.inputs.clearCaches != '' || (steps.avd-cache.outputs.cache-hit != 'true' && github.ref == 'refs/heads/main') }}"
         env:
           FIRST_BOOT_DELAY: ${{ matrix.first-boot-delay }}
         uses: reactivecircus/android-emulator-runner@v2