Add authentication to CI/CD

.drone.yml

@@ -1,17 +1,23 @@
 ---
 global-variables:
   release: &release ${DRONE_TAG}
+  docker-registry-repo: &docker-registry-repo registry.fyloz.dev:5443/colorrecipesexplorer/backend
   environment: &environment
     JAVA_VERSION: 11
     GRADLE_VERSION: 7.1
     CRE_VERSION: dev-${DRONE_BUILD_NUMBER}
     CRE_ARTIFACT_NAME: ColorRecipesExplorer
-    CRE_REGISTRY_IMAGE: registry.fyloz.dev:5443/colorrecipesexplorer/backend
+    CRE_REGISTRY_IMAGE: *docker-registry-repo
     CRE_PORT: 9101
     CRE_RELEASE: *release
+  docker-settings: &docker-settings
+    repo: *docker-registry-repo
+    username:
+      from_secret: docker_username
+    password:
+      from_secret: docker_password
   gradle-image: &gradle-image gradle:7.1-jdk11
   alpine-image: &alpine-image alpine:latest
-  docker-registry-repo: &docker-registry-repo registry.fyloz.dev:5443/colorrecipesexplorer/backend
 
 kind: pipeline
 name: default
@@ -56,7 +62,7 @@ steps:
         - GRADLE_VERSION
         - JAVA_VERSION
         - CRE_VERSION
-      repo: *docker-registry-repo
+      <<: *docker-settings
     when:
       branch: develop
       event:
@@ -73,7 +79,7 @@ steps:
         - JAVA_VERSION
       build_args:
         - CRE_VERSION=${DRONE_TAG}
-      repo: *docker-registry-repo
+      <<: *docker-settings
     when:
       event:
         - tag