fix(flex): signature verfication failed

[manojs1978]

Describe the bug
Signature verification failed [4-Signatures public key is not available

To Reproduce
Steps to reproduce the behavior:

1. download and in install gpg key

2. wget https://github.com/JanssenProject/jans/files/11814522/automation-jans-public-gpg.zip
   unzip automation-flex-public-gpg.zip;
   sudo rpm -import automation-jans-public-gpg.asc

3. download and install rpm package

4. See error

Expected behavior
should able gpg key verify

Screenshots
If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS: suse 15 sp 5
• Browser [e.g. chrome, safari]
• Version [e.g. 22]
• flex nightly

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context
Add any other context about the problem here.

Backend:  classic_rpmtrans
Continue? [y/n/v/...? shows all options] (y): y
Retrieving: bzip2-1.0.8-150400.1.122.x86_64 (OpenSUSE-15.5-OSS)                                                                                    (1/9),  44.6 KiB    
Retrieving: bzip2-1.0.8-150400.1.122.x86_64.rpm .....................................................................................................[done (8.1 KiB/s)]
Retrieving: libcjose0-0.6.1-4.3.1.x86_64 (OpenSUSE-15.5-OSS)                                                                                       (2/9),  39.0 KiB    
Retrieving: libcjose0-0.6.1-4.3.1.x86_64.rpm .......................................................................................................[done (16.1 KiB/s)]
Retrieving: libpq5-15.2-150200.5.6.1.x86_64 (OpenSUSE-15.5-OSS)                                                                                    (3/9), 184.0 KiB    
Retrieving: libpq5-15.2-150200.5.6.1.x86_64.rpm ...................................................................................................[done (792.5 KiB/s)]
Retrieving: python3-PyMySQL-0.7.11-1.21.noarch (OpenSUSE-15.5-OSS)                                                                                 (4/9), 157.5 KiB    
Retrieving: python3-PyMySQL-0.7.11-1.21.noarch.rpm ..................................................................................................[done (2.8 KiB/s)]
Retrieving: python3-ruamel.yaml.clib-0.2.0-1.1.x86_64 (OpenSUSE-15.5-OSS)                                                                          (5/9), 130.1 KiB    
Retrieving: python3-ruamel.yaml.clib-0.2.0-1.1.x86_64.rpm ...........................................................................................[done (2.9 KiB/s)]
Retrieving: apache2-mod_auth_openidc-2.3.8-lp155.5.5.x86_64 (OpenSUSE-15.5-OSS)                                                                    (6/9), 132.8 KiB    
Retrieving: apache2-mod_auth_openidc-2.3.8-lp155.5.5.x86_64.rpm .....................................................................................[done (3.0 KiB/s)]
Retrieving: python3-psycopg2-2.8.5-5.7.1.x86_64 (OpenSUSE-15.5-OSS)                                                                                (7/9), 174.8 KiB    
Retrieving: python3-psycopg2-2.8.5-5.7.1.x86_64.rpm .................................................................................................[done (2.8 KiB/s)]
Retrieving: python3-ruamel.yaml-0.16.10-1.1.noarch (OpenSUSE-15.5-OSS)                                                                             (8/9), 204.2 KiB    
Retrieving: python3-ruamel.yaml-0.16.10-1.1.noarch.rpm ..............................................................................................[done (2.9 KiB/s)]
Retrieving: flex-0.0.0-nightly.suse15.x86_64 (Plain RPM files cache)                                                                               (9/9),  1.45 GiB    
flex-0.0.0-nightly-suse15.x86_64.rpm:
    Header V4 RSA/SHA512 Signature, key ID dc3c790386c73900: NOKEY
    V4 RSA/SHA512 Signature, key ID dc3c790386c73900: NOKEY

warning: /var/tmp/zypp.mDAqL4/zypper/_tmpRPMcache_/%CLI%/flex-0.0.0-nightly-suse15.x86_64.rpm: Header V4 RSA/SHA512 Signature, key ID 86c73900: NOKEY
Looking for gpg key ID 86C73900 in cache /var/cache/zypp/pubkeys.
Repository Plain RPM files cache does not define additional 'gpgkey=' URLs.
flex-0.0.0-nightly.suse15.x86_64 (Plain RPM files cache): Signature verification failed [4-Signatures public key is not available]
Abort, retry, ignore? [a/r/i] (a): ^C
Trying to exit gracefully...
Segmentation fault