Add a few basic GitHub issue templates

Author: jajik

.github/ISSUE_TEMPLATE/ci.md

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+---
+name: "CI / GH Actions"
+about: Report an issue related to GH Actions
+title: "[CI]: "
+labels: "github_actions"
+assignees: "jajik, rhusar"
+---
+
+Thank you for opening an issue. Please replace this text and describe the issue you are facing.
+

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true

.github/ISSUE_TEMPLATE/java-mod_cluster.md

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+---
+name: Java module
+about: Report an issue with regard to the Java modules
+title: ""
+labels: java
+assignees: "rhusar"
+---
+
+Thank you for opening an issue. Please replace this text and describe the issue you are facing.
+
+Consider adding steps to reproduce and any information regarding your platform and the version (commit) you used.
+

.github/ISSUE_TEMPLATE/native-mod_proxy_cluster.md

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+---
+name: 1.3.x branch issue
+about: Report an issue with regard to the httpd module
+title: "[1.3.x]: "
+labels: 1.3.x
+assignees: "jajik"
+---
+
+Thank you for opening an issue. Please replace this text and describe the issue you are facing.
+
+Consider adding steps to reproduce and any information regarding your platform and the version (commit) you used.
+