Fix cache directory permissions

Newer npm expects a cache directory under `/.npm`.

We cleaned the cache and npm cannot create the directory anymore at
runtime (we drop privileges). So we have to create the `/.npm` directory
again during container build and later re-own it.

In `run.sh` re-own `/.npm` so it is accessible when we later drop
privileges.

latest/Dockerfile

@@ -12,6 +12,7 @@ RUN apk -U upgrade \
   && git checkout ${HASTEBIN_VERSION} \
   && npm install \
   && npm cache clean --force \
+  && mkdir /.npm \
   && apk del git \
   && rm -rf /var/lib/apk/* /var/cache/apk/* \
   && chmod +x /usr/local/bin/run.sh

latest/run.sh

@@ -5,4 +5,6 @@ set -xe
 # we have to run the chown here since the VOLUME is mounted
 # after the build with root:root
 chown -R ${UID}:${GID} /app
+chown -R ${UID}:${GID} /.npm
+
 su-exec ${UID}:${GID} npm start

stable/Dockerfile

@@ -12,6 +12,7 @@ RUN apk -U upgrade \
   && git checkout ${HASTEBIN_VERSION} \
   && npm install \
   && npm cache clean --force \
+  && mkdir /.npm \
   && apk del git \
   && rm -rf /var/lib/apk/* /var/cache/apk/* \
   && chmod +x /usr/local/bin/run.sh

stable/run.sh

@@ -5,4 +5,6 @@ set -xe
 # we have to run the chown here since the VOLUME is mounted
 # after the build with root:root
 chown -R ${UID}:${GID} /app
+chown -R ${UID}:${GID} /.npm
+
 su-exec ${UID}:${GID} npm start