Add more info about releases and handling issues with releases. (#541)

CONTRIBUTING.md

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 947d72b..815ace5 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -90,6 +90,15 @@
   - Tag will be pushed
 1. [Create new release](https://github.com/hashicorp/terraform-exec/releases/new) via GitHub UI to point to the new tag and copy the appropriate part of the CHANGELOG.md there.
 
+### Problems with the release process
+
+If you experience an error with the `release` workflow you may be able to resolve it by re-running the workflow.
+
+Known errors that can be addressed by re-running the workflow:
+* `gpg failed to sign the data`
+
+In other cases, you may need to check on the SSH and GPG keys associated with the `proj-terraform-exec-bot` bot. You can ask for help with Signore in #team-selfmanaged-releng in Slack.
+
 ## Security vulnerabilities
 
 Please disclose security vulnerabilities by following the procedure

scripts/release/README.md

diff --git a/scripts/release/README.md b/scripts/release/README.md
new file mode 100644
index 0000000..ea7a380
--- /dev/null
+++ b/scripts/release/README.md
@@ -0,0 +1 @@
+For information about the release process, see [CONTRIBUTING.md](https://github.com/hashicorp/terraform-exec/blob/main/CONTRIBUTING.md#releases)