Add release check workflow

Signed-off-by: Daniel Llewellyn <daniel@bowlhat.net>

.github/workflows/release-check.yml

@@ -0,0 +1,28 @@
+name: Check for new releases
+
+on:
+  schedule:
+  - cron: "0 * * * *"
+
+jobs:
+  new-release:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@master
+    - name: get-latest-version
+      run: |
+        VERSION="$(curl --silent --show-error --location 'https://makemkv.com/forum/viewtopic.php?f=3&t=224' \
+          | grep -E 'http://www.makemkv.com/download/makemkv-bin-[0-9]+\.[0-9]+\.[0-9]+\.tar\.gz' \
+          | head -n1 \
+          | sed -E -e 's|^.*\"http://www.makemkv.com/download/makemkv-bin-([0-9]+\.[0-9]+\.[0-9]+)\.tar\.gz\".*|\1|')"
+        EDGEVER="$(snap info makemkv | awk '$1 == "edge:" { print $2 }')"
+        if [ "$VERSION" != "$EDGEVER" ]; then
+          echo "$(date -u --rfc-3339=seconds) Version $VERSION" >> .build.stamp
+        fi
+    - uses: stefanzweifel/git-auto-commit-action@v2.1.0
+      with:
+        commit_message: Trigger build for new version
+        branch: ${{ github.head_ref }}
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}