feat: add VPNsecure.me support (#848)

- `OPENVPN_ENCRYPTED_KEY` environment variable 
- `OPENVPN_ENCRYPTED_KEY_SECRETFILE` environment variable 
- `OPENVPN_KEY_PASSPHRASE` environment variable 
- `OPENVPN_KEY_PASSPHRASE_SECRETFILE` environment variable 
- `PREMIUM_ONLY` environment variable
- OpenVPN user and password not required for vpnsecure provider

.github/ISSUE_TEMPLATE/bug.yml

@@ -57,6 +57,7 @@ body:
         - SlickVPN
         - Surfshark
         - TorGuard
+        - VPNSecure.me
         - VPNUnlimited
         - VyprVPN
         - WeVPN

.github/labels.yml

@@ -73,6 +73,8 @@
 - name: ":cloud: Torguard"
   color: "cfe8d4"
   description: ""
+- name: ":cloud: VPNSecure.me"
+  color: "cfe8d4"
 - name: ":cloud: VPNUnlimited"
   color: "cfe8d4"
   description: ""