feat: issue templates

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: 🐛 Bug Report
+description: Create a bug report to help us improve Nixpacks.
+title: ""
+labels: ["bug"]
+body:
+  - type: checkboxes
+    id: issue-already-exists
+    attributes:
+      label: Is there an existing issue for this?
+      description: |
+        Please search to see if an issue already exists for the bug you encountered.
+        Please see [Searching Issues and Pull Requests](https://docs.github.com/en/search-github/searching-on-github/searching-issues-and-pull-requests) for how to use the GitHub search bar and filters.
+      options:
+      - label: I have searched the existing issues
+        required: true
+  - type: textarea
+    id: describe-the-bugs
+    validations:
+      required: true
+    attributes:
+      label: Describe the bug
+      description: Please provide a clear and concise description about the problem you ran into.
+      placeholder: This happened when I...
+  - type: textarea
+    id: to-reproduce
+    validations:
+      required: false
+    attributes:
+      label: To reproduce
+      description: |
+        Please provide a code sample or a code snippet to reproduce the said problem. If you have code snippets, error messages or a stack trace please provide them here.
+      placeholder: |
+        Steps to reproduce the bug:
+
+          1. Provide '...'
+          2. Run '...'
+          3. See error
+  - type: textarea
+    id: expected-behavior
+    validations:
+      required: false
+    attributes:
+      label: Expected behavior
+      description: "A clear and concise description of what you would expect to happen."
+  - type: textarea
+    id: environment-info
+    attributes:
+      label: Environment
+      description: |
+        Please share your environment with us. (ie, OS, OS version and Nixpacks version)
+    validations:
+      required: true

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+version: 2.1
+contact_links:
+  - name: Nixpacks' documentation
+    url: https://nixpacks.com/
+    about: Documentation about Nixpacks. 
+  - name: Railway.
+    url: https://railway.app/
+    about: Railway.
+  - name: Nixpacks' issue tracker
+    url: https://github.com/railwayapp/nixpacks/issues
+    about: For creating issues/PR ticket for Nixpacks' development.
+  - name: Railway's Discord
+    url: discord.gg/railway
+    about: Contact the Railway team for support via Discord.
+  - name: Railway Blog
+    url: https://blog.railway.app/
+    about: To get the latest news/updates from the Railway team.
+

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: 🚀 Feature Request
+description: Submit a proposal/request for new Nixpacks feature.
+title: ""
+body:
+- type: textarea
+  id: feature-request
+  validations:
+    required: true
+  attributes:
+    label: Feature request
+    description: |
+      A clear and concise description of the feature request.
+    placeholder: |
+      An implementation could be implemented by...
+- type: textarea
+  id: motivation
+  validations:
+    required: false
+  attributes:
+    label: Motivation
+    description: |
+      Please outline the motivation for this feature request. Is your feature request related to a problem? e.g., I'm always frustrated when [...].
+      If this is related to another issue, please link here too.
+      If you have a current workaround, please also provide it here.
+    placeholder: |
+      This feature would solve ...
+- type: textarea
+  id: contribution
+  attributes:
+    label: Contribution
+    description: |
+      Is there any way that you could help, e.g. by submitting a PR? Please make sure to read the [contributing guidelines](https://github.com/railwayapp/nixpacks/blob/main/CONTRIBUTING.md).

.github/PULL_REQUEST_TEMPLATE.md

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+## What does this PR address?
+<!-- Thanks for sending a pull request! -->
+
+<!-- Remove if not applicable -->
+Fixes # (issue)
+
+## Before submitting:
+<!--- Go over all the following points, and put an `x` in all the boxes that apply. -->
+<!--- If you're unsure about any of these, don't hesitate to ask -->
+<!--- If you plan to update documentation or tests in follow-up, please note -->
+
+- [ ] Make sure to follow [GitHub's guide](https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/proposing-changes-to-your-work-with-pull-requests/creating-a-pull-request) on creating PR.
+- [ ] Did you read through [contribution guidelines](https://github.com/railwayapp/nixpacks/blob/main/CONTRIBUTING.md)?
+- [ ] Did your changes require updates to the documentation? Have you updated those accordingly?
+- [ ] Did you write tests to cover your changes? Did it pass locally when running `cargo test`?
+- [ ] Did you run `cargo fmt`, `cargo check` and `cargo clippy` locally to ensure that CI pass?