[CI] Added kube deployment and use full path for composer

.drone.yml

@@ -30,3 +30,19 @@ steps:
     tags:
     - 'v1'
     - 'latest'
+
+
+# deploy to kubernetes
+- image: 'docker.io/bitnami/kubectl'
+  name: 'deploy'
+  pull: 'always'
+  settings:
+    mtu: '1440'
+
+  environment:
+    KUBE_CONFIG:
+      from_secret: 'drone_kube_config'
+
+  commands:
+  - 'echo "$KUBE_CONFIG" > $HOME/.kube/config'
+  - 'kubectl -n roundcube rollout restart statefulsets roundcube-app'

Dockerfile.linux.amd64

@@ -6,14 +6,14 @@ RUN set -e && ln -sf bash /bin/sh
 RUN set -e \
       && apt -y update \
       && apt -y upgrade \
-      && apt -y install --no-install-recommends --no-install-suggests ca-certificates git wget \
+      && apt -y install --no-install-recommends --no-install-suggests ca-certificates git \
       && apt -y autoremove \
       && apt clean \
       && rm -rf /var/lib/apt/lists/*
 
 # install plugins using composer
 RUN set -e \
-      composer \
+      /usr/bin/composer \
         --working-dir=/usr/src/roundcubemail/ \
         --prefer-dist \
         --prefer-stable \