ci: add workflows

.github/PULL_REQUEST_TEMPLATE/pr_changelog_release_notes.md

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+# What Changed
+Whatever changed here
+
+## Release Notes
+If anything should be commented in the changelog release notes.

.github/workflows/pre-commit-check.yaml

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+name: "Pre-commit consistency check"
+
+on:
+  workflow_dispatch:
+  pull_request:
+
+concurrency:
+  group: ${{ github.head_ref }}-precommit
+  cancel-in-progress: true
+
+jobs:
+  pre-commit-check:
+    name: Run pre-commit checks
+    runs-on: ubuntu-20.04
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+
+      - uses: dorny/paths-filter@v2
+        id: filter
+        with:
+          list-files: shell
+          filters: |
+            addedOrModified:
+              - added|modified: '**'
+
+      # run only if changed files were detected
+      - name: Run against changes
+        uses: pre-commit/action@v3.0.0
+        if: steps.filter.outputs.addedOrModified == 'true'
+        with:
+          extra_args: --files ${{ steps.filter.outputs.addedOrModified_files }}
+
+      # run if no changed files were detected (e.g. workflow_dispatch on master branch)
+      - name: Run against all files
+        uses: pre-commit/action@v3.0.0
+        if: steps.filter.outputs.addedOrModified != 'true'
+        with:
+          extra_args: --all-files

.github/workflows/release-please.yml

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+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - master
+name: release-please
+jobs:
+  release-please:
+    runs-on: ubuntu-latest
+    outputs:
+      release_created: ${{ steps.release.outputs.release_created }}
+      upload_url: ${{ steps.release.outputs.upload_url }}
+    # https://github.com/google-github-actions/release-please-action in case more config is needed
+    steps:
+      - uses: google-github-actions/release-please-action@v3
+        id: release
+        with:
+          command: manifest
+          token: ${{ secrets.PAT }}
+          # See how to configure file https://github.com/googleapis/release-please/blob/main/docs/manifest-releaser.md
+      # See output info at https://github.com/google-github-actions/release-please-action#configuration for variables
+
+# Possibly optimise this by building and then passing the folder across to these stages
+  release:
+    strategy:
+      fail-fast: false
+      matrix:
+        release-task: [curseforge, discordupload, modrinth]
+    needs: release-please
+    runs-on: ubuntu-latest
+    if: ${{ needs.release-please.outputs.release_created }}
+    steps:
+      - uses: actions/checkout@v3
+      - name: Cache Gradle packages
+        uses: actions/cache@v3
+        with:
+          path: ~/.gradle/caches
+          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle') }}
+          restore-keys: ${{ runner.os }}-gradle
+      - name: Set up JDK 17
+        uses: actions/setup-java@v3
+        with:
+          distribution: 'zulu'
+          java-version: 17
+      - name: Download MC assets
+        run: ./gradlew downloadAssets || ./gradlew downloadAssets || (sleep 30s && ./gradlew downloadAssets)
+      - name: Run DataGen
+        run: ./gradlew runData
+      - name: Build and publish (release)
+        env:
+          CURSE_API: ${{ secrets.CURSE_API }}
+          DISCORD_WEBHOOK: ${{ secrets.DISCORD_WEBHOOK }}
+          MODRINTH_TOKEN: ${{ secrets.MODRINTH_TOKEN }}
+          IS_RELEASE: true
+        run: |
+          # Build
+          ./gradlew build ${{ matrix.release-task }}
+

.github/workflows/snapshots.yml

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+on:
+  push:
+    branches-ignore:
+      - master
+  workflow_dispatch:
+name: Build
+jobs:
+  snapshot:
+    #if: ${{!startsWith(github.ref.split(’/’)[2], 'release-please')}}
+    runs-on: ubuntu-latest
+    # https://github.com/google-github-actions/release-please-action in case more config is needed
+    steps:
+      - uses: actions/checkout@v3
+        # these if statements ensure that a publication only occurs when
+        # a new release is created:
+      - name: Cache Gradle packages
+        uses: actions/cache@v3
+        with:
+          path: ~/.gradle/caches
+          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle') }}
+          restore-keys: ${{ runner.os }}-gradle
+      - name: Set up JDK 17
+        uses: actions/setup-java@v2
+        with:
+          distribution: 'zulu'
+          java-version: 17
+      - name: Build and upload preview (run for non-release builds)
+        if: ${{ github.ref }}
+        env:
+          DISCORD_WEBHOOK: ${{ secrets.DISCORD_WEBHOOK }}
+        run: |
+          # Build
+          ./gradlew build discordupload