ci: add deploy stage and deploy to k8s staging environment

.gitlab-ci.yml

@@ -4,6 +4,7 @@ default:
 stages:
   - test
   - build
+  - deploy
 
 test:go:
   stage: test
@@ -58,3 +59,25 @@ build:migrations:
     - docker buildx create --name yggdrasil --use
     - docker buildx build --provenance=false --platform linux/amd64,linux/arm64 -t $IMAGE:$TAG -f build/package/migrations/Dockerfile --push .
     - docker manifest inspect $IMAGE:$TAG
+
+deploy:staging:
+  stage: deploy
+  image: ghcr.io/vojtechmares/toolkit:latest
+  rules:
+    - if: $CI_COMMIT_BRANCH == "main"
+  variables:
+    TAG: $CI_COMMIT_REF_SLUG-$CI_COMMIT_SHORT_SHA
+    NAMESPACE: yggdrasil-staging
+    GIT_DEPTH: 1 # shallow clone
+  environment:
+    name: staging
+    url: https://staging.yggdrasil.vmdevel.cz
+  script:
+    - >
+      helm upgrade --install --namespace $NAMESPACE --create-namespace \
+        api ./deploy \
+        --values deploy/values.staging.yaml \
+        --set image.tag=$TAG \
+        --set imageCredentials.username=$REGISTRY_USERNAME \
+        --set imageCredentials.password=$REGISTRY_PASSWORD \
+        --set config.database.url=$DATABASE_URL