ci: move from appveyor to actions

Author: phnx47

.github/CODEOWNERS

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+# https://help.github.com/en/github/creating-cloning-and-archiving-repositories/about-code-owners#codeowners-syntax
+# Each line is a file pattern followed by one or more owners.
+
+# These owners will be the default owners for everything.
+*       @phnx47

.github/FUNDING.yml

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+ko_fi: phnx47
+patreon: phnx47
+custom:  ['https://www.buymeacoffee.com/phnx47']

.github/renovate.json

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+{
+  "separateMajorMinor": true,
+  "labels": [
+    "dependencies"
+  ],
+  "assignees": [
+    "@phnx47"
+  ],
+  "extends": [
+    "config:base"
+  ],
+  "nuget": {
+    "enabled": true
+  }
+}

.github/workflows/branch.yml

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+name: CI
+
+on:
+  push:
+    branches:
+      - '*'
+      - '!master'
+    tags:
+      - '!refs/tags/*'
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  build-branch:
+    runs-on: ubuntu-20.04
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v1
+      - name: Setup .NET Core
+        uses: actions/setup-dotnet@v1
+      - name: Restore
+        run: dotnet restore
+      - name: Build
+        run: dotnet build --no-restore -c Release
+      - name: Tests
+        run: dotnet test --no-build -c Release

.github/workflows/master.yml

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+name: CI
+
+on:
+  push:
+    branches:
+      - 'master'
+    tags:
+      - '!refs/tags/*'
+
+jobs:
+  build-publish-dev:
+    runs-on: ubuntu-20.04
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v1
+      - name: Setup .NET Core
+        uses: actions/setup-dotnet@v1
+        with:
+          source-url: https://nuget.pkg.github.com/prometheusclientnet/index.json
+        env:
+          NUGET_AUTH_TOKEN: ${{secrets.GH_DEPLOY_KEY}}
+      - name: Restore
+        run: dotnet restore
+      - name: Build
+        run: dotnet build --no-restore -c Release
+      - name: Tests
+        run: dotnet test --no-build -c Release
+      - name: Pack artifacts
+        run: dotnet pack src/* --no-build -c Release --version-suffix dev-$(date +%s) -o artifacts/
+      - name: Publish artifacts
+        uses: actions/upload-artifact@v2
+        with:
+          name: nupkg
+          path: artifacts/*
+      - name: Publish to GitHub
+        run: dotnet nuget push "artifacts/*.nupkg" --skip-duplicate --no-symbols true

.github/workflows/production.yml

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+name: "CI"
+
+on:
+  push:
+    tags:
+      - '[34].[0-9]+.[0-9]+'
+
+jobs:
+  build:
+    runs-on: ubuntu-20.04
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v1
+      - name: Setup .NET Core
+        uses: actions/setup-dotnet@v1
+      - name: Restore
+        run: dotnet restore
+      - name: Build
+        run: dotnet build -c Release
+      - name: Tests
+        run: dotnet test -c Release --no-build
+      - name: Pack artifacts
+        run: dotnet pack src/* -c Release --no-build -o artifacts/
+      - name: Publish artifacts
+        uses: actions/upload-artifact@v2
+        with:
+          name: nupkg
+          path: artifacts/*
+      - name: Publish to NuGet
+        run: dotnet nuget push "artifacts/*.nupkg" --api-key ${{ secrets.NUGET_DEPLOY_KEY }} --source https://api.nuget.org/v3/index.json