create tempfiles in output directory

otherwise move isn't atomic if /tmp is a different filesystem

cip-grafana-tempgraph-extract

@@ -11,8 +11,8 @@ url() {
 }
 
 fetch() {
-	t=`mktemp`
-	curl --silent -H 'X-Remote-User: nobody' "$(url "$1")" > $t
+	t=$(mktemp -p "$OUTDIR")
+	curl --silent -H 'X-Remote-User: nobody' "$(url "$1")" > "$t"
 	mv $t "${OUTDIR}/${2}.png"
 }
 

cip-grafana-tempgraph-import

@@ -6,7 +6,7 @@ OUTDIR=/var/www/temperature
 IMPORTFROM="https://cipmon.informatik.uni-erlangen.de/temperature"
 
 for thing in day week month year; do
-	t=`mktemp`
-	curl --silent "${IMPORTFROM}/${thing}.png" > $t
+	t=$(mktemp -p "$OUTDIR")
+	curl --silent "${IMPORTFROM}/${thing}.png" > "$t"
 	mv $t "${OUTDIR}/${thing}.png"
 done