Split testing job into several

This patch separates the Test job of the PR workflow into several
smaller jobs: 1) create a testing sandbox and deploy Talos, 2) install
Cozystack and configure it, 3) install managed applications and run e2e
tests. This lets developers shorten the feedback loop if tests are
merely acting flaky and aren't really broken. It's not the right way,
but it's 80/20.

Signed-off-by: Timofei Larkin <lllamnyp@gmail.com>

.github/workflows/pull-requests.yaml

@@ -56,8 +56,8 @@ jobs:
           name: talos-image
           path: _out/assets/nocloud-amd64.raw.xz
  
-  test:
-    name: Test
+  prepare_env:
+    name: Prepare environment
     runs-on: [self-hosted]
     needs: build
 
@@ -66,6 +66,12 @@ jobs:
       !contains(github.event.pull_request.labels.*.name, 'release')
 
     steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+          fetch-tags: true
+
       - name: Download installer
         uses: actions/download-artifact@v4
         with:
@@ -78,5 +84,74 @@ jobs:
           name: talos-image
           path: _out/assets/
 
-      - name: Test
-        run: make test
+      - name: Set sandbox ID
+        run: echo "SANDBOX_NAME=cozy-e2e-sandbox-$(echo "${GITHUB_REPOSITORY}:${GITHUB_WORKFLOW}:${GITHUB_REF}" | sha256sum | cut -c1-10)" >> $GITHUB_ENV
+
+      - name: Prepare environment
+        run: make SANDBOX_NAME=$SANDBOX_NAME prepare-env
+
+  install_cozystack:
+    name: Install Cozystack
+    runs-on: [self-hosted]
+    needs: prepare_env
+
+    # Never run when the PR carries the "release" label.
+    if: |
+      !contains(github.event.pull_request.labels.*.name, 'release')
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+          fetch-tags: true
+
+      - name: Set sandbox ID
+        run: echo "SANDBOX_NAME=cozy-e2e-sandbox-$(echo "${GITHUB_REPOSITORY}:${GITHUB_WORKFLOW}:${GITHUB_REF}" | sha256sum | cut -c1-10)" >> $GITHUB_ENV
+
+      - name: Install Cozystack
+        run: make -C packages/core/testing SANDBOX_NAME=$SANDBOX_NAME install-cozystack
+
+  test_apps:
+    name: Test applications
+    runs-on: [self-hosted]
+    needs: install_cozystack
+
+    # Never run when the PR carries the "release" label.
+    if: |
+      !contains(github.event.pull_request.labels.*.name, 'release')
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+          fetch-tags: true
+
+      - name: Set sandbox ID
+        run: echo "SANDBOX_NAME=cozy-e2e-sandbox-$(echo "${GITHUB_REPOSITORY}:${GITHUB_WORKFLOW}:${GITHUB_REF}" | sha256sum | cut -c1-10)" >> $GITHUB_ENV
+
+      - name: E2E Apps
+        run: make -C packages/core/testing SANDBOX_NAME=$SANDBOX_NAME test-apps
+
+  cleanup:
+    name: Tear down environment
+    runs-on: [self-hosted]
+    needs: test_apps
+
+    # Never run when the PR carries the "release" label.
+    if: |
+      !contains(github.event.pull_request.labels.*.name, 'release')
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+          fetch-tags: true
+
+      - name: Set sandbox ID
+        run: echo "SANDBOX_NAME=cozy-e2e-sandbox-$(echo "${GITHUB_REPOSITORY}:${GITHUB_WORKFLOW}:${GITHUB_REF}" | sha256sum | cut -c1-10)" >> $GITHUB_ENV
+
+      - name: E2E Apps
+        run: make -C packages/core/testing SANDBOX_NAME=$SANDBOX_NAME delete