Revert "FIXME: temp disable workflows"

This reverts commit 532ffe1681.

.github/workflows/nix-meson-ver-update.yaml

@@ -0,0 +1,26 @@
+name: "Nix & Meson: update version"
+
+on: [workflow_dispatch]
+
+jobs:
+  update:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Clone repository
+      uses: actions/checkout@v3
+    - name: Update flake and meson version
+      run: |
+        REGEX="([0-9]+(\.[0-9a-zA-Z]+)+)"
+
+        CRT_REV=$(git show-ref --tags --head --abbrev | head -n 1 | head -c 7)
+        TAG_REV=$(git show-ref --tags --abbrev | tail -n 1 | head -c 7)
+        CRT_VER=$(sed -nEe "/$REGEX/{p;q;}" meson.build | awk -F\' '{print $2}')
+        VERSION=$(git show-ref --tags --abbrev | tail -n 1 | tail -c +20)
+
+        if [[ $TAG_REV = $CRT_REV ]] || [[ $CRT_VER != $VERSION ]]; then
+          sed -Ei "s/$REGEX/$VERSION/g" meson.build
+          sed -Ei "s/$REGEX/$VERSION/g" flake.nix
+        fi
+    - uses: stefanzweifel/git-auto-commit-action@v4
+      with:
+        commit_message: "[gha] bump flake and meson version"