chore: Add ref (#72)

Fix

.github/workflows/e2e.yml

@@ -15,3 +15,5 @@ concurrency:
 jobs:
   aqua-playground:
     uses: ./.github/workflows/tests.yml
+    with:
+      ref: ${{ github.ref }}

.github/workflows/tests.yml

@@ -3,6 +3,10 @@ name: Run tests with workflow_call
 on:
   workflow_call:
     inputs:
+      ref:
+        description: "git ref to checkout to"
+        type: string
+        default: "master"
       fluence-env:
         description: "Fluence enviroment to run tests agains"
         type: string
@@ -62,6 +66,7 @@ jobs:
         uses: actions/checkout@v3
         with:
           repository: fluencelabs/aqua-playground
+          ref: ${{ inputs.ref }}
 
       - name: Pull rust-peer image
         run: docker pull $RUST_PEER_IMAGE