diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 0000000..d741e40
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,9 @@
+root = true
+
+[*]
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+indent_style = space
+indent_size = 4
diff --git a/Dockerfile b/Dockerfile
index 63d306b..294339b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,6 @@
 FROM quay.io/thallian/confd-env:latest
 
-RUN apk add --no-cache postfix postfix-ldap rsyslog spamassassin-client libstdc++ g++ make tar
-RUN apk add --no-cache --repository http://dl-3.alpinelinux.org/alpine/edge/testing/ --allow-untrusted libmilter-dev
+RUN apk add --no-cache postfix postfix-ldap rsyslog spamassassin-client libstdc++ g++ make tar libmilter-dev
 
 RUN mkdir /tmp/spamass-milter
 RUN wget -qO- http://download.savannah.gnu.org/releases/spamass-milt/spamass-milter-0.4.0.tar.gz | tar -xz -C /tmp/spamass-milter --strip 1