[misc] Add GPG signing key support for rpm packages (#5581)

* [misc] Add GPG signing key support for deb and rpm packages

* [misc] Improve GPG key management for deb and rpm signing

* [misc] Extract GPG key import logic into a reusable script

* [misc] Add key fingerprint extraction and targeted export for GPG keys

* [misc] Remove passphrase from GPG keys before exporting

* [misc] Simplify GPG key management by removing import script

* [misc] Bump GoReleaser version to v2.14.3 in release workflow

* [misc] Replace GPG passphrase variables with NFPM-prefixed alternatives in workflows and configs

* [misc] Update naming conventions for package IDs and passphrase variables in workflows and configs

* [misc] Standardize NFPM variable naming in release workflow

* [misc] Adjust NFPM variable names for consistency in release workflow

* [misc] Remove Debian signing GPG key usage in workflows and configs

.goreleaser_ui.yaml

@@ -61,7 +61,7 @@ nfpms:
   - maintainer: Netbird <dev@netbird.io>
     description: Netbird client UI.
     homepage: https://netbird.io/
-    id: netbird-ui-deb
+    id: netbird_ui_deb
     package_name: netbird-ui
     builds:
       - netbird-ui
@@ -80,7 +80,7 @@ nfpms:
   - maintainer: Netbird <dev@netbird.io>
     description: Netbird client UI.
     homepage: https://netbird.io/
-    id: netbird-ui-rpm
+    id: netbird_ui_rpm
     package_name: netbird-ui
     builds:
       - netbird-ui
@@ -95,11 +95,14 @@ nfpms:
         dst: /usr/share/pixmaps/netbird.png
     dependencies:
       - netbird
+    rpm:
+      signature:
+        key_file: '{{ if index .Env "GPG_RPM_KEY_FILE" }}{{ .Env.GPG_RPM_KEY_FILE }}{{ end }}'
 
 uploads:
   - name: debian
     ids:
-      - netbird-ui-deb
+      - netbird_ui_deb
     mode: archive
     target: https://pkgs.wiretrustee.com/debian/pool/{{ .ArtifactName }};deb.distribution=stable;deb.component=main;deb.architecture={{ if .Arm }}armhf{{ else }}{{ .Arch }}{{ end }};deb.package=
     username: dev@wiretrustee.com
@@ -107,7 +110,7 @@ uploads:
 
   - name: yum
     ids:
-      - netbird-ui-rpm
+      - netbird_ui_rpm
     mode: archive
     target: https://pkgs.wiretrustee.com/yum/{{ .Arch }}{{ if .Arm }}{{ .Arm }}{{ end }}
     username: dev@wiretrustee.com