add arg to docker build

.drone.yml

@@ -0,0 +1,30 @@
+kind: pipeline
+type: docker
+name: default
+steps:
+  - name: build-image
+    image: docker:dind
+    volumes:
+      - name: dockersock
+        path: /var/run
+    environment:
+      DOCKER_USERNAME:
+        from_secret: DOCKER_USERNAME
+      DOCKER_PASSWORD:
+        from_secret: DOCKER_PASSWORD
+    commands:
+      - sleep 10
+      - echo "$DOCKER_PASSWORD" | docker login --username "$DOCKER_USERNAME" --password-stdin registry.kmlabz.com
+      - docker build -t registry.kmlabz.com/tormakris/drone-kaniko .
+      - docker push registry.kmlabz.com/tormakris/drone-kaniko
+
+services:
+- name: docker
+  image: docker:dind
+  privileged: true
+  volumes:
+  - name: dockersock
+    path: /var/run
+volumes:
+- name: dockersock
+  temp: {}

Dockerfile

@@ -1,4 +1,4 @@
-FROM gcr.io/kaniko-project/executor:debug-v0.16.0
+FROM gcr.io/kaniko-project/executor:debug
 
 ENV HOME /root
 ENV USER root

plugin.sh

@@ -42,6 +42,14 @@ if [[ "${PLUGIN_CACHE:-}" == "true" ]]; then
     CACHE="--cache=true"
 fi
 
+if [ -n "${PLUGIN_CACHE_REPO:-}" ]; then
+    CACHE_REPO="--cache-repo=${REGISTRY}/${PLUGIN_CACHE_REPO}"
+fi
+
+if [ -n "${PLUGIN_CACHE_TTL:-}" ]; then
+    CACHE_TTL="--cache-ttl=${PLUGIN_CACHE_TTL}"
+fi
+
 if [ -n "${PLUGIN_BUILD_ARGS:-}" ]; then
     BUILD_ARGS=$(echo "${PLUGIN_BUILD_ARGS}" | tr ',' '\n' | while read build_arg; do echo "--build-arg=${build_arg}"; done)
 fi
@@ -94,6 +102,8 @@ fi
     ${EXTRA_OPTS} \
     ${DESTINATIONS} \
     ${CACHE:-} \
+    ${CACHE_TTL:-} \
+    ${CACHE_REPO:-} \
     ${TARGET:-} \
     ${BUILD_ARGS:-} \
     ${BUILD_ARGS_FROM_ENV:-}