Add Dockerfile.

Dockerfile

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+FROM alpine:latest
+
+RUN apk --no-cache add \
+  python3 \
+  py3-pip \
+  py3-yaml \
+  py3-click \
+  py3-dnspython \
+ && python3 -m pip install \
+  ovh \
+  schema
+
+COPY main.py /usr/local/bin/ovhddns
+COPY periodic.sh /usr/local/bin/ovhddns-periodic
+ENTRYPOINT [ "ovhddns-periodic" ]

README.md

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+# OVHDDNS
+
+Update a OVH subdomain to own IP.
+
+## Configuration file
+
+```yaml
+---
+ovh:
+  application_key: str
+  application_secret: str
+  consumer_key: str
+  endpoint: str
+zone: str; example: redxef.at
+subdomain: str; example: subdomain-xyz
+field_type: *Optional* str; example: 'A' or 'AAAA'
+logging: *Optional*
+  level: *Optional* str; default: :WARNING,ovhdns:INFO
+ttl: *Optional* int; default: None
+```

main.py

@@ -1,13 +1,11 @@
 #!/usr/bin/env python3
 
 import itertools
-import json
 import os
 import sys
 import logging
 
 import yaml
-import schema
 import click
 import ovh
 import dns.resolver

periodic.sh

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+#!/bin/sh
+
+pids=""
+
+run_prog() {
+    "$@" &
+    pids="$! $pids"
+}
+
+trap_sig() {
+    printf '%s' "$pids" | while IFS= read -r pid; do
+        echo "pid=$pid"
+        # shellcheck disable=2086
+        kill -s $1 $pid
+    done
+}
+
+trap 'trap_sig TERM' TERM
+
+# default to every 5 minutes
+DELAY="${OVHDDNS_INTERVAL_SECONDS:-300}"
+
+stdin_content="$(cat -)"
+
+while :; do
+    echo "$stdin_content" | ovhddns "$@"
+    run_prog sleep "$DELAY"
+    wait $pids
+    pids=
+done
+