reference environment variable with actions syntax

.forgejo/workflows/build.yaml

@@ -25,8 +25,8 @@ jobs:
       - name: Upload
         uses: actions/upload-artifact@v3
         with:
-          name: $BINARY_NAME
-          path: zig-out/bin/$BINARY_NAME
+          name: ${{ env.BINARY_NAME }}
+          path: zig-out/bin/${{ env.BINARY_NAME }}
       - name: Notify
         uses: https://git.lerch.org/lobo/action-notify-ntfy@v2
         if: always() && env.GITEA_ACTIONS == 'true'
@@ -47,9 +47,9 @@ jobs:
       - name: Download Artifact
         uses: actions/download-artifact@v3
         with:
-          name: $BINARY_NAME
+          name: ${{ env.BINARY_NAME }}
       - name: "Make executable actually executable"
-        run: chmod 755 $BINARY_NAME && mv $BINARY_NAME docker
+        run: chmod 755 ${{ env.BINARY_NAME }} && mv ${{ env.BINARY_NAME }} docker
       - name: Get short ref
         id: vars
         run: echo "shortsha=$(git rev-parse --short HEAD)" >> $GITHUB_OUTPUT