Quote environment variables

Ansible gets unhappy if there are values that could be interpreted by YAML
(e.g. boolean values or numbers), so quote everything as a principle.

pottwal.yml

@@ -217,9 +217,9 @@
         restart_policy: unless-stopped
         detach: yes
         env:
-          POSTGRES_USER: hedgedoc
+          POSTGRES_USER: "hedgedoc"
           POSTGRES_PASSWORD: "{{ hedgedoc_postgres_password }}"
-          POSTGRES_DB: hedgedoc
+          POSTGRES_DB: "hedgedoc"
         volumes:
           - "/srv/data/hedgedoc/data/database:/var/lib/postgresql/data"
         networks:
@@ -236,14 +236,14 @@
           - "{{ hedgedoc_host_port }}:3000"
         restart_policy: unless-stopped
         env:
-          NODE_ENV: production
-          CMD_DOMAIN: pad.n39.eu
-          CMD_URL_ADDPORT: true
-          CMD_DB_HOST: hedgedocdb
-          CMD_DB_PORT: 5432
-          CMD_DB_DIALECT: postgres
-          CMD_DB_DATABASE: hedgedoc
-          CMD_DB_USERNAME: hedgedoc
+          NODE_ENV: "production"
+          CMD_DOMAIN: "pad.n39.eu"
+          CMD_URL_ADDPORT: "true"
+          CMD_DB_HOST: "hedgedocdb"
+          CMD_DB_PORT: "5432"
+          CMD_DB_DIALECT: "postgres"
+          CMD_DB_DATABASE: "hedgedoc"
+          CMD_DB_USERNAME: "hedgedoc"
           CMD_DB_PASSWORD: "{{ hedgedoc_postgres_password }}"
         volumes:
           - /srv/data/hedgedoc/data/uploads:/hedgedoc/public/uploads