Fix env variables

Dockerfile

@@ -1,2 +1,6 @@
 FROM gitea/gitea:1.16.9
 
+COPY entrypoint-wrapper parse-database-url /usr/bin/
+RUN chmod 755 /usr/bin/entrypoint-wrapper /usr/bin/parse-database-url
+
+ENTRYPOINT ["/usr/bin/entrypoint-wrapper"]

entrypoint-wrapper

@@ -0,0 +1,12 @@
+#!/bin/sh
+# vim: set ts=2 sw=2 et ft=bash:
+
+eval "$(/usr/bin/parse-database-url "${DATABASE_URL:-}" GITEA__database__ |sed -e 's/^/export /')"
+
+# Rename variables
+GITEA__database__DB_TYPE="$GITEA__database__PROTO"
+GITEA__database__PASSWD="$GITEA__database__PASS"
+export GITEA__database__DB_TYPE
+export GITEA__database__PASSWD
+
+exec /usr/bin/entrypoint "$@"

parse-database-url

@@ -0,0 +1,35 @@
+#!/bin/sh
+# Referenced and tweaked from http://stackoverflow.com/questions/6174220/parse-url-in-shell-script#6174447
+
+url="$1"
+prefix="$2"
+proto="$(echo "$url" | grep :// | sed -e 's,^\(.*\)://.*,\1,g')"
+# remove the protocol
+workurl="$(echo "$url" |sed -e "s,^$proto://,,")"
+# extract the user (if any)
+userpass="$(echo "$workurl" | grep @ | cut -d@ -f1)"
+pass="$(echo "$userpass"| grep : | cut -d: -f2)"
+if [ -n "$pass" ]; then
+  user="$(echo "$userpass" | grep : | cut -d: -f1)"
+else
+    user="$userpass"
+fi
+
+# extract the host
+hostport="$(echo "$workurl" |sed -e "s,$userpass@,," | cut -d/ -f1)"
+# by request - try to extract the port
+port="$(echo "$hostport" | sed -e 's,^.*:,:,g' -e 's,.*:\([0-9]*\).*,\1,g' -e 's,[^0-9],,g')"
+host="$(echo "$hostport" | cut -d: -f1)"
+# extract the path (if any)
+path="/$(echo "$workurl" | grep / | cut -d/ -f2-)"
+name="$(echo "$workurl" | grep / | cut -d/ -f2-)"
+
+echo "${prefix}_URL=\"$url\""
+echo "${prefix}_PROTO=\"$proto\""
+echo "${prefix}_USER=\"$user\""
+echo "${prefix}_PASS=\"$pass\""
+echo "${prefix}_HOST=\"$host\""
+echo "${prefix}_PORT=\"$port\""
+echo "${prefix}_PATH=\"$path\""
+echo "${prefix}_NAME=\"$name\""
+