use `github.ref` instead of `inputs.ref`

[ci skip]

.github/workflows/debian.yml

@@ -3,9 +3,6 @@ name: Build Debian Package
 on:
   workflow_dispatch:
     inputs:
-      ref:
-        description: 'GitHub Ref (e.g. refs/tags/1.6.16)'
-        required: true
       semver:
         description: 'SemVer String (e.g. 1.7.0-beta1)'
         required: true
@@ -29,9 +26,6 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v3
-        with:
-          ref: ${{ inputs.ref }}
-          fetch-depth: 0
       - id: versions
         name: Get version information
         run: |
@@ -141,15 +135,10 @@ jobs:
         run: dput ppa:sebastian-stenzel/cryptomator-beta cryptomator_*_source.changes
       
       # If ref is a tag, also upload to GitHub Releases:
-      - name: Determine tag name
-        if: startsWith(inputs.ref, 'refs/tags/')
-        run: |
-          REF=${{ inputs.ref }}
-          echo "TAG_NAME=${REF##*/}" >> $GITHUB_ENV
       - name: Publish Debian package on GitHub Releases
-        if: startsWith(inputs.ref, 'refs/tags/')
+        if: startsWith(github.ref, 'refs/tags/')
         env:
           GITHUB_TOKEN: ${{ secrets.CRYPTOBOT_RELEASE_TOKEN }}
         run: |
           artifacts=$(ls | grep cryptomator*.deb)
-          gh release upload ${{ env.TAG_NAME }} $artifacts
+          gh release upload ${{ github.ref_name }} $artifacts