ci(e2e): test s3 cache exporter

Signed-off-by: CrazyMax <1951866+crazy-max@users.noreply.github.com>

.github/workflows/.e2e-run.yml

@@ -25,6 +25,10 @@ on:
       password_secret:
         required: false
         type: string
+      cache:
+        required: false
+        type: string
+        default: registry
 
 env:
   HARBOR_VERSION: v2.13.2
@@ -56,6 +60,24 @@ jobs:
         if: inputs.type == 'local'
         run: |
           cat ./.github/e2e/${{ inputs.id }}/env >> $GITHUB_ENV
+      -
+        name: Set up outputs
+        uses: actions/github-script@v8
+        env:
+          INPUT_SLUG: ${{ env.REGISTRY_SLUG || inputs.slug }}
+          INPUT_CACHE: ${{ inputs.cache }}
+        with:
+          script: |
+            const inpSlug = core.getInput('slug');
+            const inpCache = core.getInput('cache');
+            if (inpCache === 'registry') {
+              core.exportVariable('CACHE_FROM', `type=registry,ref=${inpSlug}:master`);
+              core.exportVariable('CACHE_TO', 'type=inline');
+            } else if (inpCache === 's3') {
+              const cacheName = inpSlug.replace(/[^a-zA-Z0-9]/g, '-').toLowerCase();
+              core.exportVariable('CACHE_FROM', `type=s3,region=us-east-2,bucket=buildkit-s3-cache-test,name=${cacheName}`);
+              core.exportVariable('CACHE_TO', `type=s3,region=us-east-2,bucket=buildkit-s3-cache-test,name=${cacheName}`);
+            }
       -
         name: Set up BuildKit config
         run: |
@@ -121,8 +143,12 @@ jobs:
           push: ${{ github.event_name != 'pull_request' }}
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
-          cache-from: type=registry,ref=${{ env.REGISTRY_SLUG || inputs.slug }}:master
-          cache-to: type=inline
+          cache-from: ${{ env.CACHE_FROM }}
+          cache-to: ${{ env.CACHE_TO }}
+        env:
+          AWS_ACCESS_KEY_ID: ${{ secrets.AWS_S3_ACCESS_KEY_ID }}
+          AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_S3_SECRET_ACCESS_KEY }}
+          AWS_SESSION_TOKEN: ${{ secrets.AWS_S3_SESSION_TOKEN }}
       -
         name: Inspect image
         run: |