adding a readme for the gpg management process (#7019)

Signed-off-by: Adam D. Cornett <adc@redhat.com>

Author: acornett21

.ci/gpg/README.md

@@ -0,0 +1,116 @@
+# SDK GPG Keys
+
+## Current *key*pers
+
+The keys are currently in the hands of [Joe Lanford](https://github.com/joelanford/).
+
+## Transferring keys
+
+In order to transfer the keys to other members of the Operator SDK admins, following the following:
+
+1. get public GPG key from the person(s) you will transfer to
+2. import their key into your keyring
+
+```
+gpg --import KEY
+```
+
+3. verify their identity, is this really their key. Video call can be useful for this.
+4. sign their key
+
+```
+gpg --sign-key EMAIL-OF-USERS-KEY
+```
+
+5. export the SDK public key
+
+```
+gpg --export --armor  -o 3B2F1481D146238080B346BB052996E2A20B5C7E.pub    .asc 3B2F1481D146238080B346BB052996E2A20B5C7
+```
+6. export the SDK private key
+
+```
+gpg --export-secret-key --armor -o 3B2F1481D146238080B346BB052996E2A2    0B5C7E.priv.asc 3B2F1481D146238080B346BB052996E2A20B5C7E
+```
+7. export the SDK sub key
+
+```
+gpg --export-secret-subkeys --armor -o 3B2F1481D146238080B346BB052996    E2A20B5C7E.sub_priv.asc 3B2F1481D146238080B346BB052996E2A20B5C7E
+```
+
+8. encrypt each key for the person
+
+```
+gpg --encrypt --sign --armor -r EMAIL-OF-USERS-KEY --output 052996E2A20B5C7E.subkey.private.asc.enc 052996E2A20B5C7E.subkey.private.asc
+```
+
+9. send them the encrypted key to the user
+
+10. user should be able to decrypt with their key.
+
+## Updating expiration date
+
+There will be a few people that have the keys. Those people should be able to update the expiration date. This won't have to be done until November 8, 2025.
+
+You will want to update the date of the key:
+
+```
+gpg --edit-key (key id)
+```
+
+Once you're in the gpg console select the key , there are 2, you need to update both. I just pick a 3 year term.
+
+```
+gpg> expire
+(follow prompts)
+3y
+gpg> save
+```
+
+You can use whatever term the team wants.
+
+One of the resources I used: [How to change the expiration date of a GPG key](https://www.g-loaded.eu/2010/11/01/change-expiration-date-gpg-key/)
+
+## Sending keys to keyserver
+
+Once you have the keys updated, you should send them to a keyserver. I have a couple examples, not sure if both are needed.
+
+```
+gpg --keyserver keyserver.ubuntu.com --send-key 3B2F1481D146238080B346BB052996E2A20B5C7E
+gpg --keyserver pgp.mit.edu --send-key 3B2F1481D146238080B346BB052996E2A20B5C7E
+```
+
+I *think* you only need to send it to one server, most of the commands in my shell history use `pgp.mit.edu`
+
+## Updating secring.auto.gpg
+
+Once you have the keys updated, you need to regenerate the keyrings that are stored in the [SDK repo](https://github.com/operator-framework/operator-sdk/tree/master/.ci/gpg).
+
+Use the SDK key to sign and encrypt it. You need to use `--local-user` to avoid GPG from using your own key.
+
+```
+gpg --cipher-algo AES256 --output secring.auto.gpg --local-user "cncf-operator-sdk@cncf.io" --sign --symmetric 3B2F1481D146238080B346BB052996E2A20B5C7E.sub_priv.asc
+```
+
+## Updating pubring.auto
+
+This is the public keyring. It's simply the public key. Export the public key then rename it as `pubring.auto`
+
+```
+gpg --export --armor -o 3B2F1481D146238080B346BB052996E2A20B5C7E.pub.asc 3B2F1481D146238080B346BB052996E2A20B5C7E
+cp 3B2F1481D146238080B346BB052996E2A20B5C7E.pub.asc pubring.auto
+```
+
+## CI usage of keys
+
+The GPG keys are stored in [.ci/gpg](https://github.com/operator-framework/operator-sdk/tree/master/.ci/gpg) of the Operator SDK repo.
+
+In Github settings, there is a `GPG_PASSWORD` environment variable. It is set here in the [Environments](https://github.com/operator-framework/operator-sdk/settings/environments/172302554/edit) tab. You need to be admin.
+
+The `GPG_PASSWORD` has been encrypted and handed to a few people. These people are the keepers of the password.
+
+## Original process
+
+The original keys were setup using the following article.
+
+https://blogs.itemis.com/en/secure-your-travis-ci-releases-part-2-signature-with-openpgp