add automated release workflow

.github/release-drafter.yml

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+template: |
+	## What's Changed
+
+	$CHANGES

.github/workflows/release.yml

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+name: Release new version
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'The version number to use'
+        default: '0.0.0.0'
+        # Input has to be provided for the workflow to run
+        required: true
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Validate version number
+      run: |
+        # validate version structure
+        bash -c '[[ ${{ github.event.inputs.version }} =~ ^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+$ ]] || exit 1'
+        # ensure version doesn't already exist
+        bash -c 'git rev-parse "v${{ github.event.inputs.version }}" >/dev/null 2>&1 && exit 2 || exit 0'
+    - name: Checkout
+      uses: actions/checkout@v2.3.3
+    - name: Install dependencies
+      run: sudo apt install nuget mono-complete make
+    - name: Update version number, and commit
+      run: |
+        sed -ri "s/Version\(\"[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+\"\)/Version\(\"${{ github.event.inputs.version }}\"\)/g" AssemblyInfo.cs
+        git -c user.name="Github Actions" -c user.email="dyc3@users.noreply.github.com" commit -m "Update version" AssemblyInfo.cs
+    - name: Build
+      run: |
+        make
+        mv build steamguard-cli-v${{ github.event.inputs.version }}
+        tar -cf steamguard-cli-v${{ github.event.inputs.version }}.tar.gz steamguard-cli-v${{ github.event.inputs.version }}
+    - name: Tag and push version commit
+      run: |
+        git push origin master
+        git tag -a "v${{ github.event.inputs.version }}" -m "Release v${{ github.event.inputs.version }}"
+        git push origin "v${{ github.event.inputs.version }}"
+    - name: Upload Build Artifact
+      uses: actions/upload-artifact@v2.2.0
+      with:
+        name: build
+        path: steamguard-cli-v${{ github.event.inputs.version }}.tar.gz
+  deb-package:
+    runs-on: ubuntu-latest
+    needs: [build]
+    steps:
+    - name: Download Build Artifact (tar)
+      uses: actions/download-artifact@v2.0.5
+      with:
+        name: build
+    - run: |
+        tar -xf steamguard-cli-v${{ github.event.inputs.version }}.tar.gz
+        mv steamguard-cli-v${{ github.event.inputs.version }} build
+        bash package.sh
+    - name: Upload deb
+      uses: actions/upload-artifact@v2.2.0
+      with:
+        name: deb
+        path: steamguard-cli_${{ github.event.inputs.version }}-0.deb
+  # TODO: update AUR pkgbuild
+  draft:
+    needs: [build, deb-package]
+    runs-on: ubuntu-latest
+    steps:
+    - name: Download Build Artifact (tar)
+      uses: actions/download-artifact@v2.0.5
+      with:
+        name: build
+    - name: Download Build Artifact (deb)
+      uses: actions/download-artifact@v2.0.5
+      with:
+        name: deb
+    - name: Release Drafter
+      uses: release-drafter/release-drafter@v5.11.0
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      with:
+        name: v${{ github.event.inputs.version }}
+        tag: v${{ github.event.inputs.version }}
+        version: ${{ github.event.inputs.version }}
+        publish: false