Implement flag/config falue for GPG provider

man/aptly.1

@@ -46,6 +46,7 @@ Configuration file is stored in JSON format (default values shown below):
   "dependencyVerboseResolve": false,
   "gpgDisableSign": false,
   "gpgDisableVerify": false,
+  "gpgProvider": "gpg",
   "downloadSourcePackages": false,
   "skipLegacyPool": true,
   "ppaDistributorID": "ubuntu",
@@ -148,6 +149,10 @@ don\(cqt sign published repositories with gpg(1), also can be disabled on per\-r
 don\(cqt verify remote mirrors with gpg(1), also can be disabled on per\-mirror basis using \fB\-ignore\-signatures\fR flag when creating and updating mirrors
 .
 .TP
+\fBgpgProvider\fR
+implementation of PGP signing/validation \- \fBgpg\fR for external \fBgpg\fR utility or \fBinternal\fR to use Go internal implementation
+.
+.TP
 \fBdownloadSourcePackages\fR
 if enabled, all mirrors created would have flag set to download source packages; this setting could be controlled on per\-mirror basis with \fB\-with\-sources\fR flag
 .
@@ -427,6 +432,10 @@ when processing dependencies, follow Suggests
 \-\fBdep\-verbose\-resolve\fR=false
 when processing dependencies, print detailed logs
 .
+.TP
+\-\fBgpg\-provider\fR=
+PGP implementation ("gpg" for external gpg or "internal" for Go internal implementation)
+.
 .SH "CREATE NEW MIRROR"
 \fBaptly\fR \fBmirror\fR \fBcreate\fR \fIname\fR \fIarchive url\fR \fIdistribution\fR [\fIcomponent1\fR \|\.\|\.\|\.]
 .
@@ -1984,4 +1993,3 @@ Clemens Rabe (https://github\.com/seeraven)
 TJ Merritt (https://github\.com/tjmerritt)
 .
 .IP "" 0
-

man/aptly.1.ronn.tmpl

@@ -38,6 +38,7 @@ Configuration file is stored in JSON format (default values shown below):
       "dependencyVerboseResolve": false,
       "gpgDisableSign": false,
       "gpgDisableVerify": false,
+      "gpgProvider": "gpg",
       "downloadSourcePackages": false,
       "skipLegacyPool": true,
       "ppaDistributorID": "ubuntu",
@@ -127,6 +128,10 @@ Options:
     don't verify remote mirrors with gpg(1), also can be disabled on
     per-mirror basis using `-ignore-signatures` flag when creating and updating mirrors
 
+  * `gpgProvider`:
+    implementation of PGP signing/validation - `gpg` for external `gpg` utility or
+    `internal` to use Go internal implementation
+
   * `downloadSourcePackages`:
     if enabled, all mirrors created would have flag set to download source packages;
     this setting could be controlled on per-mirror basis with `-with-sources` flag