Fix CI builds (#85)

<!-- Please describe your pull request here. -->

## References

- TODO

<!-- References to relevant GitHub issues and pull requests, esp.
upstream and downstream changes -->

## Submitter checklist

- [ ] Recommended: Join [WireMock Slack](https://slack.wiremock.org/) to
get any help in `#help-contributing` or a project-specific channel like
`#wiremock-java`
- [ ] Recommended: If you participate in Hacktoberfest 2023, make sure
you're [signed up](https://wiremock.org/events/hacktoberfest/) there and
in the WireMock form
- [ ] The PR request is well described and justified, including the body
and the references
- [ ] The PR title represents the desired changelog entry
- [ ] The repository's code style is followed (see the contributing
guide)
- [ ] Test coverage that demonstrates that the change works as expected
- [ ] For new features, there's necessary documentation in this pull
request or in a subsequent PR to
[wiremock.org](https://github.com/wiremock/wiremock.org)

<!--
Put an `x` into the [ ] to show you have filled the information.
The template comes from
https://github.com/wiremock/.github/blob/main/.github/pull_request_template.md
You can override it by creating .github/pull_request_template.md in your
own repository
-->

Author: oleg-nenashev

.github/workflows/build-and-test.yml

@@ -34,4 +34,4 @@ jobs:
       - name: Run the Gradle package task
         uses: gradle/gradle-build-action@v2
         with:
-          arguments: build check
+          arguments: build check

.gitignore

@@ -29,3 +29,4 @@ replay_pid*
 !gradle/wrapper/gradle-wrapper.jar
 build/
 .gradle/
+bin/

build.gradle

@@ -86,10 +86,12 @@ signing {
     required {
         !version.toString().contains("SNAPSHOT") && (gradle.taskGraph.hasTask("uploadArchives") || gradle.taskGraph.hasTask("publish"))
     }
-    def signingKey = providers.environmentVariable("OSSRH_GPG_SECRET_KEY").get()
-    def signingPassphrase = providers.environmentVariable("OSSRH_GPG_SECRET_KEY_PASSWORD").get()
-    useInMemoryPgpKeys(signingKey, signingPassphrase)
-    sign(publishing.publications)
+    def signingKey = providers.environmentVariable("OSSRH_GPG_SECRET_KEY").orElse(null)
+    def signingPassphrase = providers.environmentVariable("OSSRH_GPG_SECRET_KEY_PASSWORD").orElse(null)
+    if (signingKey != null && signingPassphrase != null) {
+        useInMemoryPgpKeys(signingKey, signingPassphrase)
+        sign(publishing.publications)
+    }
 }
 
 publishing {