Add PR build workflow and issue templates

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug Report
+description: Report an issue with Hex Casting
+labels:
+  - bug
+  - unconfirmed
+
+body:
+  - type: dropdown
+    attributes:
+      label: Modloader
+      options:
+        - Forge
+        - Fabric
+        - Quilt
+    validations:
+      required: true
+
+  - type: input
+    attributes:
+      label: Minecraft version
+      placeholder: eg. 1.19.2
+    validations:
+      required: true
+
+  - type: input
+    attributes:
+      label: Hex Casting version
+      placeholder: eg. 0.11.1-7-pre-609
+    validations:
+      required: true
+
+  - type: input
+    attributes:
+      label: Modloader version
+      description: |
+        List the version of the mod loader you are using.
+        If on Fabric, post the versions of both Fabric Loader and Fabric API.
+      placeholder: "eg. Forge: 36.2.9 / Fabric: Loader 0.10.6 + API 0.42.1"
+
+  - type: input
+    attributes:
+      label: Modpack info
+      description: If playing a modpack, post the link to it!
+
+  - type: input
+    attributes:
+      label: The latest.log file
+      description: Please use https://mclo.gs/ if possible. Sites like https://gist.github.com/ or https://pastebin.com/ are also acceptable.
+
+  - type: textarea
+    attributes:
+      label: Issue description
+      placeholder: A description of the issue.
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Steps to reproduce
+      placeholder: |
+        1. First step
+        2. Second step
+        3. etc...
+
+  - type: textarea
+    attributes:
+      label: Other information
+      description: Any other relevant information that is related to this issue, such as other mods and their versions.

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature Request
+description: Suggest an improvement or a new feature
+labels:
+  - enhancement
+  - unconfirmed
+
+body:
+  - type: textarea
+    attributes:
+      label: Describe the feature
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Additional context
+      description: Any other relevant information (eg. use cases, alternative solutions)

.github/workflows/pr.yml

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+# mirror of the Jenkins pipeline, used for requiring PRs to build successfully before merging
+# this uses Actions because it's easier to integrate with GitHub PRs, and to allow running the build on forks
+
+name: Build pull request
+
+on:
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: "17.0.1"
+      - uses: gradle/actions/setup-gradle@v3
+
+      - name: Clean
+        run: |
+          chmod +x gradlew
+          ./gradlew clean
+
+      - name: Build
+        run: ./gradlew build
+
+      - name: Run Datagen
+        run: ./gradlew runAllDatagen
+
+      - name: Check Datagen
+        run: |
+          git add --intent-to-add .
+          git diff --name-only --exit-code -- ":!:*/src/generated/resources/.cache/*"