feat: Add TTL purge script

Closes #21

Dockerfile

@@ -16,7 +16,6 @@ RUN \
 
 FROM debian:buster-slim
 # FROM debian:buster  # for debugging docker build
-MAINTAINER <src+pushbox@jrconlin.com>
 RUN \
     groupadd --gid 10001 app && \
     useradd --uid 10001 --gid 10001 --home /app --create-home app && \
@@ -28,6 +27,7 @@ RUN \
 
 COPY --from=builder /app/bin /app/bin
 COPY --from=builder /app/version.json /app
+COPY --from=builder /app/purge.bash /app
 
 WORKDIR /app
 USER app

purge.bash

@@ -0,0 +1,11 @@
+#! /bin/bash -w
+# This presumes login data is stored in .mylogin.cnf,
+# $MYSQL_HOST is set to the default mysql host
+# & $PUSHBOX_DATABASE is the name of the containing database.
+# If the PUSHBOX_DATABASE is not defined, this script will attempt
+# to extract it from the `Rocket.toml` file.
+if [ "$PUSHBOX_DATABASE" = "" ]; then
+    echo "Fetching database..."
+    PUSHBOX_DATABASE=`grep "^database_url" Rocket.toml | sed 's/"//g'| tr '/' "\n" | tail -1`
+fi
+mysql $PUSHBOX_DATABASE -e "DELETE FROM pushboxv1 WHERE ttl < unix_timestamp();"