ci: run `build-release-binaries.yml` only if pushed tag

.github/workflows/build-release-binaries.yml

@@ -2,8 +2,8 @@ name: Build release binaries (and publish them if this is a tag)
 
 on:
   push:
-    branches:
-      - main
+    tags:
+      - "*"
 
   # pull_request:
 
@@ -135,25 +135,3 @@ jobs:
           asset_name: cloud-$tag-${{ matrix.release_name }}
           body: ${{ steps.changelog_reader.outputs.log_entry }}
         if: startsWith(github.ref, 'refs/tags/v')
-
-  crates:
-    name: Publish to crates.io
-    runs-on: ubuntu-latest
-
-    if: startsWith(github.ref, 'refs/tags/v')
-
-    steps:
-      - name: Checkout code
-        uses: actions/checkout@v3
-
-      - name: Setup Rust toolchain
-        uses: actions-rs/toolchain@v1
-        with:
-          toolchain: stable
-          target: ${{ matrix.target }}
-
-      - name: Publish to crates.io
-        uses: actions-rs/cargo@v1
-        with:
-          command: publish
-          args: --token ${{ secrets.CARGO_REGISTRY_TOKEN }}