chore(ci): add Agola CI config

.agola/config.yml

@@ -0,0 +1,52 @@
+version: v0
+runs:
+  - name: Lint
+    tasks:
+      - name: Checkout code
+        runtime:
+          containers:
+            - image: docker.io/alpine/git
+        steps:
+          - clone:
+          - save_to_workspace:
+              contents:
+                - source_dir: .
+                  dest_dir: .
+                  paths:
+                    - '**'
+
+      - name: Run .NET tests
+        runtime:
+          containers:
+            - image:  mcr.microsoft.com/dotnet/sdk:6.0
+              environment:
+                DOCKER_HOST: tcp://127.0.0.1:2375
+                INETMOCK_SOCKET: http://127.0.0.1:6767
+            - image: code.icb4dc0.de/prskr/ci-images/dind:latest
+              privileged: true
+        steps:
+          - restore_workspace:
+              dest_dir: .
+          - run:
+              name: .NET tests
+              command: |-
+                dotnet tool restore
+                dotnet nuke Test
+        depends:
+          - Checkout code
+
+      - name: Lint protobuf
+        runtime:
+          containers:
+            - image: docker.io/bufbuild/buf:latest
+        steps:
+          - restore_workspace:
+              dest_dir: .
+          - run:
+              name: buf lint
+              command: |-
+                buf ls-files
+                buf lint
+              working_dir: ~/project/api/proto
+        depends:
+          - Checkout code