release: remove load: true from docker/build-push-action

We seem to have gotten away with not loading before, and trying to set
both load=true and push=true results in

  Error: buildx failed with: ERROR: push and load may not be set together at the moment

There's basically no information available online about this, and it
*seems* to just be a current limitation of build-push-action? Looking
into the source did not illuminate anything.

We were previously just using push=true (both here and in
neondatabase/neonvm), so this commit switches back to that.

.github/workflows/release.yaml

@@ -64,7 +64,6 @@ jobs:
           context: .
           platforms: linux/amd64
           push: true
-          load: true
           file: neonvm/runner/Dockerfile
           tags: ${{ env.IMG_RUNNER }}:${{ steps.get_vcs_info.outputs.version }}
 
@@ -75,7 +74,6 @@ jobs:
           context: .
           platforms: linux/amd64
           push: true
-          load: true
           file: neonvm/Dockerfile
           tags: ${{ env.IMG }}:${{ steps.get_vcs_info.outputs.version }}
 
@@ -85,7 +83,6 @@ jobs:
           context: .
           platforms: linux/amd64
           push: true
-          load: true
           file: neonvm/tools/vxlan/Dockerfile
           tags: ${{ env.IMG_VXLAN }}:${{ steps.get_vcs_info.outputs.version }}
 
@@ -121,7 +118,6 @@ jobs:
         with:
           context: .
           push: true
-          load: true
           file: build/autoscale-scheduler/Dockerfile
           tags: ${{ env.SCHED_IMAGE }}:${{ steps.get_vcs_info.outputs.version }}
           build-args: |
@@ -131,7 +127,6 @@ jobs:
         with:
           context: .
           push: true
-          load: true
           file: build/autoscaler-agent/Dockerfile
           tags: ${{ env.AGENT_IMAGE }}:${{ steps.get_vcs_info.outputs.version }}
           build-args: |
@@ -141,7 +136,6 @@ jobs:
         with:
           context: .
           push: true
-          load: true
           file: build/vm-informant/Dockerfile
           tags: ${{ env.INFORMANT_IMAGE }}:${{ steps.get_vcs_info.outputs.version }}
           build-args: |