Automatically update nightly-build tag every nightly release (#4374)

This is done by CI force pushing the `nightly-build` tag - the `nightly-build` tag should never be relied on other than for GitHub releases.

.CI/CreateUbuntuDeb.sh

@@ -42,7 +42,7 @@ fi
 
 chatterino_version=$(git describe 2>/dev/null | cut -c 2-) || true
 if [ -z "$chatterino_version" ]; then
-    # Fall back to this in case the build happened outside of a git repo
+    # Fall back to this in case the build happened outside of a git repo or a repo without tags
     chatterino_version="0.0.0-dev"
 fi
 

.github/workflows/build.yml

@@ -311,6 +311,9 @@ jobs:
     if: (github.event_name == 'push' && github.ref == 'refs/heads/master')
 
     steps:
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: 0 # allows for tags access
       - uses: actions/download-artifact@v3
         with:
           name: chatterino-windows-x86-64-5.15.2.zip
@@ -352,3 +355,9 @@ jobs:
           prerelease: true
           name: Nightly Release
           tag: nightly-build
+
+      - name: Update nightly-build tag
+        run: |
+          git tag -f nightly-build
+          git push -f origin nightly-build
+        shell: bash