ci: remove wavm machine release

We are not planning to have an STF that differs from upstream. So this
shouldn't be needed anymore.

.github/workflows/espresso-docker.yml

@@ -6,10 +6,6 @@
 # so it's possible this was always the culprit.
 #
 # After building, the images are merged together to make a multiplatform image.
-#
-# The latest wavm machine is also copied and exported as an artifact. In nitro
-# this seems to be later used as machine for the non-dev nitro-node build.
-# For more details on that see the Dockerfile and ./scripts/download.sh
 name: Espresso Docker build CI
 run-name: Docker build CI triggered from @${{ github.actor }} of ${{ github.head_ref }}
 
@@ -121,36 +117,6 @@ jobs:
           platforms: ${{ matrix.platform }}
           push: ${{ github.event_name != 'pull_request' }}
 
-      # The module root is not identical for the ARM build so we upload
-      # the binary only for AMD64.
-      - name: Extract WAVM machine from container and print its root
-        if: ${{ matrix.platform == 'linux/amd64' && github.event_name != 'pull_request' }}
-        id: module-root
-        run: |
-          # Unfortunately, `docker cp` seems to always result in a "permission denied"
-          # We work around this by piping a tarball through stdout
-          digest="${{ steps.nitro-node-dev.outputs.digest }}"
-          image=ghcr.io/espressosystems/nitro-espresso-integration/nitro-node-dev@$digest
-          docker run --rm --entrypoint tar $image -cf - target/machines/latest | tar xf -
-          ls -lah target/machines/latest
-          module_root="$(cat "target/machines/latest/module-root.txt")"
-          echo "module-root=$module_root" >> $GITHUB_OUTPUT
-          echo -e "\x1b[1;34mWAVM module root:\x1b[0m $module_root"
-
-      - name: Upload WAVM machine as artifact
-        uses: actions/upload-artifact@v3
-        if: ${{ matrix.platform == 'linux/amd64' && github.event_name != 'pull_request' }}
-        with:
-          name: wavm-machine-${{ steps.module-root.outputs.module-root }}
-          path: target/machines/latest/*
-          if-no-files-found: error
-
-      - name: Release wasm binary
-        uses: softprops/action-gh-release@v1
-        if: matrix.platform == 'linux/amd64' && startsWith(github.ref, 'refs/tags/')
-        with:
-          files: target/machines/latest/*
-
       - name: Check available space after CI run
         if: "!cancelled()"
         run: |