Avoid running "Publish Tester Build" workflow on tag push

In order to provide coverage for projects using release branches, the "Publish Tester Build" workflow has a `create`
event trigger. This trigger is intended to cause the workflow to run on the creation of a release branch.

The same `create` event also occurs when a tag is pushed to the repository. There is no need to generate a tester build
for tags because these are only made after the project is in a fully tested state and the tag push will trigger a
release build that makes a generated tester build superfluous anyway. For this reason, and because the triggering of the
tester build on this event can cause problems in some project, the workflow is configured to skip the generation of the
tester build when it was triggered by a tag push.

.github/workflows/publish-go-tester-task.yml

@@ -36,10 +36,12 @@ jobs:
         id: determination
         run: |
           RELEASE_BRANCH_REGEX="refs/heads/[0-9]+.[0-9]+.x"
+          TAG_REGEX="refs/tags/.*"
           # The `create` event trigger doesn't support `branches` filters, so it's necessary to use Bash instead.
           if [[
             ("${{ github.event_name }}" != "create" ||
-            "${{ github.ref }}" =~ $RELEASE_BRANCH_REGEX)
+            "${{ github.ref }}" =~ $RELEASE_BRANCH_REGEX) &&
+            ! "${{ github.ref }}" =~ $TAG_REGEX
           ]]; then
             # Run the other jobs.
             RESULT="true"