Add support for alerting on success or failure of renewal

Installs apprise and allows config of alerting for successful or failed renewals. Currently only supports renewals, not inital issuing. Not necessarily a problem as I'd hope you'd be watching the logs on first run.
I don't love how I create /config/.renew-list.sh. I should readdress this somehow

Dockerfile

@@ -18,6 +18,9 @@ ENV TZ=UTC
 ENV GENERATE_DHPARAM=true
 ENV INTERVAL="0 */6 * * *"
 ENV ONE_SHOT=false
+ENV APPRISE_URL=
+ENV NOTIFY_ON_FAILURE=false
+ENV NOTIFY_ON_SUCCESS=false
 
 # Single domain
 ENV DOMAINS=
@@ -62,14 +65,14 @@ RUN apk add --no-cache --virtual .deps gcc python3-dev libc-dev libffi-dev && \
     /app/certbot/bin/pip install wheel && \
     /app/certbot/bin/pip install "Cython<3.0" pyyaml --no-build-isolation && \
     /app/certbot/bin/pip install -r /app/certbot/requirements.txt && \
-    ln -s /app/certbot/bin/certbot /usr/bin/certbot &&\
+    ln -s /app/certbot/bin/certbot /usr/bin/certbot && \
+    ln -s /app/certbot/bin/apprise /usr/bin/apprise && \
     apk del .deps
 
 COPY root /
 
 RUN chmod +x /container-init.sh && \
     chmod +x /certbot-prepare.sh && \
-    chmod +x /certbot-renew.sh && \
     chmod +x /check-one-shot.sh && \
     chown -R ${PUID}:${PGID} /app /config