CI: not use dunamai github action as it uses plain pip, not uv pip

.forgejo/workflows/build.yaml

@@ -28,19 +28,13 @@ jobs:
         run: .venv/bin/pytest -s tests/basic.py
 
       - name: Get version
-        uses: mtkennerly/dunamai-action@v1
-        with:
-          args: --style semver
-          env-var: VERSION
+        run: echo "VERSION=$(.venv/bin/dunamai --style semver)" >> $GITHUB_ENV
 
       - name: Version
         run: echo $VERSION
 
       - name: Get distance from tag
-        uses: mtkennerly/dunamai-action@v1
-        with:
-          args: --format "{distance}"
-          env-var: DISTANCE
+        run: echo "DISTANCE=$(.venv/bin/dunamai --format '{distance}')" >> $GITHUB_ENV
 
       - name: Distance
         run: echo $DISTANCE