Added the missing containers from rpi-docker-images

gandi/Dockerfile

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+FROM alpine:latest
+
+ADD updatedns.sh /usr/bin/updatedns.sh
+
+RUN apk add --no-cache curl jq \
+	&& chmod +x /usr/bin/updatedns.sh
+
+CMD /usr/bin/updatedns.sh

gandi/README.md

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+Docker image to automatically update Gandi DNS with the current IP adress
+
+# Status
+[![Github link](https://assets-cdn.github.com/favicon.ico)](https://github.com/napnap75/rpi-docker-images/) [![Docker hub link](https://www.docker.com/favicon.ico)](https://hub.docker.com/r/napnap75/rpi-gandi/)
+
+
+# Content
+This image is based [my own Alpine Linux base image](https://hub.docker.com/r/napnap75/rpi-alpine-base/).
+
+This image contains :
+- the python Gandi CLI for the v4 version
+- curl and jq to access Gandi REST API for the v5 version
+
+# Usage
+Use this image to update a DNS record to the current IP of the host: `docker run -e GANDI_API_KEY="YOUR GANDI API KEY" -e GANDI_HOST="THE HOST NAME IN THE GANDI DOMAIN" -e GANDI_DOMAIN="YOUR GANDI DOMAIN" --name gandi napnap75/rpi-gandi:latest`
+Use the following images :
+- `napnap75/rpi-gandi:v4` if you use the v4 version of Gandi
+- `napnap75/rpi-gandi:v5` or `napnap75/rpi-gandi:latest` if you use the v5 version of Gandi
+
+Every 5 minutes, the image will automatically check the current IP address of the host and, if necessary, update the DNS.

gandi/updatedns.sh

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+#!/bin/bash
+
+# First check if the gandi cli is properly configured, otherwise configure it
+
+while true ; do
+  # Get my current IP
+  my_ip=$(curl -s https://api.ipify.org)
+
+  # Get my currently registered IP
+  current_record=$(curl -s -H"X-Api-Key: $GANDI_API_KEY" https://dns.api.gandi.net/api/v5/domains/$GANDI_DOMAIN/records | jq -c '.[] | select(.rrset_name == "'$GANDI_HOST'") | select(.rrset_type == "A")')
+  current_ip=$(echo $current_record | jq -r '.rrset_values[0]')
+
+  # Check if both IP addresses are correct
+  if [[ "$my_ip" =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ && "$current_ip" =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]] ; then
+    # If they do not match, change it (and keep the TTL and TYPE)
+    if [[ "$my_ip" != "$current_ip" ]]; then
+      echo "Updating $GANDI_HOST.$GANDI_DOMAIN record with IP $my_ip"
+      current_ttl=$(echo $current_record | jq -r '.rrset_ttl')
+      curl -s -X PUT -H "Content-Type: application/json" -H "X-Api-Key: $GANDI_API_KEY" -d '{"rrset_ttl": '$current_ttl', "rrset_values":["'$my_ip'"]}' https://dns.api.gandi.net/api/v5/domains/$GANDI_DOMAIN/records/$GANDI_HOST/A
+
+      # If the update was OK
+      if [[ $? == 0 ]] ; then
+        # Send a notification to Slack
+        if [[ "$SLACK_URL" != "" ]] ; then
+          curl -o /dev/null -s -X POST -d "payload={\"username\": \"gandi\", \"icon_emoji\": \":dart:\", \"text\": \"New IP $my_ip for host $GANDI_HOST.$GANDI_DOMAIN\"}" $SLACK_URL
+        fi
+
+        # Send a notification to Healthchecks
+        if [[ "$HEALTHCHECKS_URL" != "" ]] ; then
+          curl -o /dev/null -s -m 10 --retry 5 $HEALTHCHECKS_URL
+        fi
+      fi
+    else
+      # Send a notification to Healthchecks
+      if [[ "$HEALTHCHECKS_URL" != "" ]] ; then
+        curl -o /dev/null -s -m 10 --retry 5 $HEALTHCHECKS_URL
+      fi
+    fi
+  fi
+
+  # Wait 5 minutes
+  sleep 300
+done