Add GitHub Actions workflows for building and releasing the Jellyfin plugin

.gitea/workflows/build.yaml

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+name: '🏗️ Build Plugin'
+
+on:
+  push:
+    branches:
+      - main
+      - dev
+    paths-ignore:
+      - '**/*.md'
+  pull_request:
+    branches:
+      - main
+    paths-ignore:
+      - '**/*.md'
+  workflow_dispatch:
+
+jobs:
+  call:
+    uses: ./.github/workflows/build_internal.yaml

.gitea/workflows/build_internal.yaml

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+on:
+  workflow_call:
+    inputs:
+      dotnet-version:
+        required: false
+        default: "9.0.x"
+        description: "The .NET version to setup for the build"
+        type: string
+      dotnet-target:
+        required: false
+        default: "net9.0"
+        description: "The .NET target to set for JPRM"
+        type: string
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+
+      - name: Setup .NET
+        uses: actions/setup-dotnet@2016bd2012dba4e32de620c46fe006a3ac9f0602 # v5.0.1
+        with:
+          dotnet-version: "${{ inputs.dotnet-version }}"
+
+      - name: Build Jellyfin Plugin
+        uses: oddstr13/jellyfin-plugin-repository-manager@9497a0a499416cc572ed2e07a391d9f943a37b4d # v1.1.1
+        id: jprm
+        with:
+          dotnet-target: "${{ inputs.dotnet-target }}"
+
+      - name: Upload Artifact
+        uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6
+        with:
+          name: build-artifact
+          retention-days: 30
+          if-no-files-found: error
+          path: ${{ steps.jprm.outputs.artifact }}

.gitea/workflows/release_automation.yml

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+name: Auto Release Plugin
+
+on:
+  push:
+    branches:
+      - main
+    paths-ignore:
+      - '.github/**'
+      - 'README.md'
+      - 'jellyfin.ruleset'
+      - '.gitignore'
+      - '.editorconfig'
+      - 'LICENSE'
+      - 'logo.png'
+
+jobs:
+  build-and-release:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v6
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v5
+        with:
+          dotnet-version: '9.x'
+
+      - name: Read Version from Manifest
+        id: read_version
+        run: |
+          VERSION=$(jq -r '.[0].versions[0].version' manifest.json)
+          CHANGELOG=$(jq -r '.[0].versions[0].changelog' manifest.json)
+          TARGET_ABI=$(jq -r '.[0].versions[0].targetAbi' manifest.json)
+          
+          echo "Detected Version: $VERSION"
+          echo "VERSION=$VERSION" >> $GITHUB_ENV
+          
+          # Escape newlines in changelog for GITHUB_ENV
+          echo "CHANGELOG<<EOF" >> $GITHUB_ENV
+          echo "$CHANGELOG" >> $GITHUB_ENV
+          echo "EOF" >> $GITHUB_ENV
+
+      - name: Build and Zip
+        shell: bash
+        run: |
+          # Inject version from manifest into the build
+          dotnet build Jellyfin.Plugin.Seasonals/Jellyfin.Plugin.Seasonals.csproj --configuration Release --output bin/Publish /p:Version=${{ env.VERSION }} /p:AssemblyVersion=${{ env.VERSION }}
+          
+          cd bin/Publish
+          zip -r Jellyfin.Plugin.Seasonals.zip *
+          cd ../..
+          
+          # Calculate hash
+          HASH=$(md5sum bin/Publish/Jellyfin.Plugin.Seasonals.zip | awk '{ print $1 }')
+          TIME=$(date -u +"%Y-%m-%dT%H:%M:%SZ")
+          
+          # Export variables for next steps
+          echo "ZIP_HASH=$HASH" >> $GITHUB_ENV
+          echo "BUILD_TIME=$TIME" >> $GITHUB_ENV
+          echo "ZIP_PATH=bin/Publish/Jellyfin.Plugin.Seasonals.zip" >> $GITHUB_ENV
+
+      - name: Update manifest.json
+        shell: bash
+        run: |
+            REPO_OWNER="${{ github.repository_owner }}"
+            REPO_NAME="${{ github.event.repository.name }}"
+            VERSION="${{ env.VERSION }}"
+            DOWNLOAD_URL="https://git.mahom03-spacecloud.de/${{ github.repository }}/releases/download/v$VERSION/Jellyfin.Plugin.Seasonals.zip"
+            
+            echo "Updating manifest.json with:"
+            echo "Hash: ${{ env.ZIP_HASH }}"
+            echo "Time: ${{ env.BUILD_TIME }}"
+            echo "Url:  $DOWNLOAD_URL"
+            
+            jq --arg hash "${{ env.ZIP_HASH }}" \
+             --arg time "${{ env.BUILD_TIME }}" \
+             --arg url "$DOWNLOAD_URL" \
+             '.[0].versions[0].checksum = $hash | .[0].versions[0].timestamp = $time | .[0].versions[0].sourceUrl = $url' \
+             manifest.json > manifest.json.tmp && mv manifest.json.tmp manifest.json
+
+      - name: Commit manifest.json
+        uses: stefanzweifel/git-auto-commit-action@v7
+        with:
+          commit_message: "Update manifest.json for release v${{ env.VERSION }} [skip ci]"
+          file_pattern: manifest.json
+
+      - name: Create Release
+        uses: akkuman/gitea-release-action@v1
+        with:
+          server_url: "https://git.mahom03-spacecloud.de"
+          body: ${{ env.CHANGELOG }}
+          token: ${{ secrets.GITHUB_TOKEN }}
+          files: ${{ env.ZIP_PATH }}
+          name: "v${{ env.VERSION }}"
+          tag_name: "v${{ env.VERSION }}"
+          draft: false
+          prerelease: false