ci: setup SemaphoreCI v2 (#479)

Update Semaphore configuration

Author: tonyghita

.semaphore/semaphore.yml

@@ -0,0 +1,21 @@
+version: v1.0
+name: Go
+agent:
+  machine:
+    type: e1-standard-2
+    os_image: ubuntu2004
+blocks:
+  - name: Test
+    task:
+      jobs:
+        - name: go test
+          commands:
+            - sem-version go 1.17
+            - export GO111MODULE=on
+            - export GOPATH=~/go
+            - 'export PATH=/home/semaphore/go/bin:$PATH'
+            - checkout
+            - go version
+            - go get ./...
+            - go test ./...
+            - go build -v .