Use shared kaniko build template

Closes: #10

.gitlab-ci.yml

+include:
+  - remote: https://open.greenhost.net/openappstack/openappstack/raw/master/.gitlab/ci_templates/kaniko.yml
+
 stages:
   - build
   - build-test-images
   - application-test
 
-consent-provider:
+consent_provider:
   stage: build
-  image:
-    name: gcr.io/kaniko-project/executor:debug
-    entrypoint: [""]
-  script:
-    - echo "{\"auths\":{\"$CI_REGISTRY\":{\"username\":\"$CI_REGISTRY_USER\",\"password\":\"$CI_REGISTRY_PASSWORD\"}}}" > /kaniko/.docker/config.json
-    - /kaniko/executor --context ${CI_PROJECT_DIR}/consent_provider --dockerfile ${CI_PROJECT_DIR}/consent_provider/Dockerfile --destination $CI_REGISTRY_IMAGE/consent_provider:${CI_COMMIT_REF_NAME}
+  variables:
+    KANIKO_BUILD_IMAGENAME: $CI_JOB_NAME
+  extends: .kaniko_build
   only:
     changes:
       - consent_provider/**/*
       - .gitlab-ci.yml
 
-login-provider:
+login_provider:
   stage: build
-  image:
-    name: gcr.io/kaniko-project/executor:debug
-    entrypoint: [""]
-  script:
-    - echo "{\"auths\":{\"$CI_REGISTRY\":{\"username\":\"$CI_REGISTRY_USER\",\"password\":\"$CI_REGISTRY_PASSWORD\"}}}" > /kaniko/.docker/config.json
-    - /kaniko/executor --context ${CI_PROJECT_DIR}/login_provider --dockerfile ${CI_PROJECT_DIR}/login_provider/Dockerfile --destination $CI_REGISTRY_IMAGE/login_provider:${CI_COMMIT_REF_NAME}
+  variables:
+    KANIKO_BUILD_IMAGENAME: $CI_JOB_NAME
+  extends: .kaniko_build
   only:
     changes:
       - login_provider/**/*
       - .gitlab-ci.yml
 
-login-provider-mock:
+login_provider_mock:
   stage: build-test-images
-  image:
-    name: gcr.io/kaniko-project/executor:debug
-    entrypoint: [""]
-  script:
-    - echo "{\"auths\":{\"$CI_REGISTRY\":{\"username\":\"$CI_REGISTRY_USER\",\"password\":\"$CI_REGISTRY_PASSWORD\"}}}" > /kaniko/.docker/config.json
-    - /kaniko/executor --context ${CI_PROJECT_DIR}/login_provider/test/behave --dockerfile ${CI_PROJECT_DIR}/login_provider/test/behave/Dockerfile --destination $CI_REGISTRY_IMAGE/login_provider_mock:${CI_COMMIT_REF_NAME} --build-arg baseimage=$CI_REGISTRY_IMAGE/login_provider:${CI_COMMIT_REF_NAME}
+  variables:
+    KANIKO_BUILD_IMAGENAME: $CI_JOB_NAME
+  extends: .kaniko_build
   only:
     changes:
       - login_provider/**/*
       - .gitlab-ci.yml
 
-login-provider-test:
+login_provider_test:
   stage: build-test-images
-  image:
-    name: gcr.io/kaniko-project/executor:debug
-    entrypoint: [""]
-  script:
-    - echo "{\"auths\":{\"$CI_REGISTRY\":{\"username\":\"$CI_REGISTRY_USER\",\"password\":\"$CI_REGISTRY_PASSWORD\"}}}" > /kaniko/.docker/config.json
-    - /kaniko/executor --context ${CI_PROJECT_DIR}/login_provider/test --dockerfile ${CI_PROJECT_DIR}/login_provider/test/Dockerfile --destination $CI_REGISTRY_IMAGE/login_provider_ci_test:${CI_COMMIT_REF_NAME}
+  variables:
+    KANIKO_BUILD_IMAGENAME: $CI_JOB_NAME
+  extends: .kaniko_build
   only:
     changes:
       - login_provider/**/*