ci: add cache-key to test workflows for v2 compatibility (#110)

Add the required cache-key input to test-action.yml and
step-duration-regression.yml so they work on the release/v2 branch.
Also trigger on push to release/v2 branch.

Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

Author: piob-io

.github/workflows/step-duration-regression.yml

@@ -8,7 +8,7 @@ on:
   workflow_dispatch:
   pull_request:
   push:
-    branches: [main]
+    branches: [main, release/v2]
   schedule:
     - cron: "17 6 * * *"
 
@@ -27,6 +27,7 @@ jobs:
       - name: ${{ env.SETUP_STEP_NAME }}
         uses: ./
         with:
+          cache-key: test/step-duration-regression
           buildx-version: v0.23.0
 
       - name: Trivial build

.github/workflows/test-action.yml

@@ -4,7 +4,7 @@ on:
   workflow_dispatch:
   pull_request:
   push:
-    branches: [main]
+    branches: [main, release/v2]
 
 jobs:
   test-setup:
@@ -43,6 +43,7 @@ jobs:
       - name: Test Docker Builder Setup
         uses: ./
         with:
+          cache-key: test/setup-docker-builder
           buildx-version: "v0.23.0"
           nofallback: "false"
         continue-on-error: true # Allow failure since we may not have Blacksmith env vars
@@ -97,6 +98,7 @@ jobs:
       - name: Test Docker Builder Setup with Driver Options
         uses: ./
         with:
+          cache-key: test/setup-docker-builder-driver-opts
           buildx-version: "v0.23.0"
           driver-opts: |
             env.TEST_VAR_1=value1