alpine 3.10; postsrsd on alpine 3.10; set domain via $SRS_DOMAIN

Dockerfile

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+FROM alpine:3.10
+
+RUN adduser -S postsrsd \
+    && apk add --no-cache postsrsd \
+    && mkdir -p /etc/postsrsd/secrets \
+    && chown postsrsd /etc/postsrsd/secrets
+
+USER postsrsd
+
+VOLUME /etc/postsrsd/secrets
+
+ENV SRS_DOMAIN change-me.tld
+ENV SRS_SECRET /etc/postsrsd/secrets/list
+
+# forward SRS lookup
+EXPOSE 10001/tcp
+# reverse SRS lookup
+EXPOSE 10002/tcp
+
+# > Cannot open file with secret: /etc/postsrsd/secrets/list
+CMD touch "$SRS_SECRET" && postsrsd -l0.0.0.0 -e

README.md

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+# postsrsd ✉️ 🐳
+
+Roehling's Postfix Sender Rewriting Scheme Daemon
+
+https://github.com/roehling/postsrsd
+
+## Usage
+
+See https://github.com/fphammerle/docker-postfix/blob/master/ansible-playbooks/forward.yml

docker-compose.yml

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+version: '2'
+
+volumes:
+  secrets:
+
+services:
+  postsrsd:
+    build: .
+    image: fphammerle/postsrsd
+    volumes:
+    - secrets:/etc/postsrsd/secrets:rw
+    environment:
+      SRS_DOMAIN: change-me.tld
+    security_opt: [no-new-privileges]
+    restart: always
+
+# https://docs.docker.com/compose/compose-file/compose-file-v2/