ci: Init e2e testing in CI

Adds a github action triggering an end to end test of edgehog on backend
changes.

Signed-off-by: Luca Zaninotto <luca.zaninotto@secomind.com>

Author: lusergit

.github/actions/export-container/action.yaml

@@ -0,0 +1,34 @@
+#
+# This file is part of Edgehog.
+#
+# Copyright 2025 SECO Mind Srl
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+name: export-container
+description: "Export backend conteatiner into a `backend.tar` artifact."
+runs:
+  using: "composite"
+  steps:
+    - name: Create image tar
+      shell: bash
+      run: |
+        docker image save edgehogdevicemanager/edgehog-backend:latest -o backend.tar
+    - uses: actions/upload-artifact@v4
+      with:
+        path: backend.tar
+        name: backend.tar
+        if-no-files-found: error

.github/actions/import-container/action.yaml

@@ -0,0 +1,30 @@
+#
+# This file is part of Edgehog.
+#
+# Copyright 2025 SECO Mind Srl
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+name: import container
+description: "Export backend conteatiner into a `backend.tar` artifact."
+runs:
+  using: "composite"
+  steps:
+    - uses: actions/download-artifact@v5
+    - name: Import backend container
+      shell: bash
+      run: |
+        docker image load < backend.tar

.github/workflows/backend-e2e.yaml

@@ -104,7 +104,7 @@ _init-edgehog:
 _create-edgehog-tenant edgehog-hostname="api.edgehog.localhost":
     #!/usr/bin/env bash
     admin_jwt=$(cat backend/priv/repo/seeds/keys/admin_jwt.txt)
-    curl -sf -X POST "http://{{edgehog-hostname}}/admin-api/v1/tenants" \
+    curl --fail-with-body -X POST "http://{{edgehog-hostname}}/admin-api/v1/tenants" \
          -H "Content-Type: application/vnd.api+json" \
          -H "Accept: application/vnd.api+json" \
          -H "Authorization: Bearer $admin_jwt" \