ci: add prerelease workflow and extend dotnet-ci to release-* branches

Author: spbsoluble

.github/workflows/dotnet-ci.yml

@@ -7,6 +7,7 @@ on:
   pull_request:
     branches:
       - main
+      - "release-*"
     paths:
       - "**/*.cs"
       - "**/*.csproj"

.github/workflows/prerelease.yml

@@ -0,0 +1,55 @@
+name: Prerelease
+
+on:
+  push:
+    branches:
+      - "release-*"
+
+permissions:
+  contents: write
+
+jobs:
+  prerelease:
+    name: Create Prerelease
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: "8.0.x"
+
+      - name: Restore and build
+        run: |
+          dotnet restore certinext-caplugin.sln
+          dotnet build certinext-caplugin.sln --no-restore --configuration Release
+
+      - name: Run unit tests
+        run: |
+          dotnet test certinext-caplugin.sln \
+            --no-build \
+            --configuration Release \
+            --verbosity normal
+
+      - name: Derive version from branch name
+        id: version
+        run: |
+          # release-1.0 → v1.0.0-pre.<run_number>
+          BRANCH="${GITHUB_REF_NAME}"
+          BASE=$(echo "$BRANCH" | sed 's/^release-//')
+          TAG="v${BASE}.0-pre.${{ github.run_number }}"
+          echo "tag=${TAG}" >> "$GITHUB_OUTPUT"
+          echo "name=CERTInext Plugin ${TAG}" >> "$GITHUB_OUTPUT"
+
+      - name: Create GitHub prerelease
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          gh release create "${{ steps.version.outputs.tag }}" \
+            --title "${{ steps.version.outputs.name }}" \
+            --notes "Automated prerelease from branch \`${GITHUB_REF_NAME}\` at commit \`${GITHUB_SHA:0:7}\`." \
+            --prerelease \
+            --target "${GITHUB_REF_NAME}"