feat(store): add traefik-certs-dumper app

apps/traefik-certs-dumper/config.json

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+{
+  "$schema": "../schema.json",
+  "name": "Traefik Certs Dumper",
+  "available": true,
+  "exposable": false,
+  "no_gui": true,
+  "port": 9999,
+  "id": "traefik-certs-dumper",
+  "tipi_version": 1,
+  "version": "1.6.1",
+  "categories": [
+    "utilities",
+    "security"
+  ],
+  "description": "Dumps Let's Encrypt certificates of a specified domain which Traefik stores in acme.json.",
+  "short_desc": "Dumps Let's Encrypt certificates of a specified domain which Traefik stores in acme.json.",
+  "author": "kereis",
+  "source": "https://github.com/kereis/traefik-certs-dumper",
+  "form_fields": []
+}

apps/traefik-certs-dumper/docker-compose.yml

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+version: "3.8"
+
+services:
+  traefik-certs-dumper:
+    container_name: traefik-certs-dumper
+    # user: root
+    image: humenius/traefik-certs-dumper:1.6.1-alpine
+    restart: unless-stopped
+    healthcheck:
+      test: ["CMD", "/usr/bin/healthcheck"]
+      interval: 30s
+      timeout: 10s
+      retries: 5
+    volumes:
+      - /root/runtipi/traefik/shared/acme.json:/traefik/acme.json:ro
+      - ${APP_DATA_DIR}/data/certs:/output:rw
+    environment:
+      - ACME_FILE_PATH=/traefik/acme.json
+    networks:
+      - tipi_main_network
+    labels:
+      # Main
+      traefik.enable: false

apps/traefik-certs-dumper/metadata/description.md

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+# traefik-certs-dumper
+
+Dumps Let's Encrypt certificates of a specified domain to `.pem` and `.key` files which Traefik stores in `acme.json`.
+
+This image uses:
+
+- a bash script that derivates from [mailu/traefik-certdumper](https://hub.docker.com/r/mailu/traefik-certdumper)
+- [ldez's traefik-certs-dumper](https://github.com/ldez/traefik-certs-dumper)
+
+Special thanks to them!
+
+## Help
+
+If you need help using this image, have suggestions or want to report a problem, feel free to open an issue on GitHub!