Make build docker full fix (#29570)

* [#29569]: Added creation of missing directory 

For image [ubuntu] : /etc/grafana/provisioning/plugins was missing in image creation.

* [#29569]: Added creation of missing directory 

For image [alpine] : /etc/grafana/provisioning/plugins was missing in image creation.

Dockerfile

@@ -64,6 +64,7 @@ RUN export GF_GID_NAME=$(getent group $GF_GID | cut -d':' -f1) && \
     mkdir -p "$GF_PATHS_PROVISIONING/datasources" \
              "$GF_PATHS_PROVISIONING/dashboards" \
              "$GF_PATHS_PROVISIONING/notifiers" \
+             "$GF_PATHS_PROVISIONING/plugins" \
              "$GF_PATHS_LOGS" \
              "$GF_PATHS_PLUGINS" \
              "$GF_PATHS_DATA" && \

Dockerfile.ubuntu

@@ -58,6 +58,7 @@ RUN mkdir -p "$GF_PATHS_HOME/.aws" && \
   mkdir -p "$GF_PATHS_PROVISIONING/datasources" \
              "$GF_PATHS_PROVISIONING/dashboards" \
              "$GF_PATHS_PROVISIONING/notifiers" \
+             "$GF_PATHS_PROVISIONING/plugins" \
              "$GF_PATHS_LOGS" \
              "$GF_PATHS_PLUGINS" \
              "$GF_PATHS_DATA" && \