.github: Run release style builds on all PRs

Adjust the release workflow to move the conditional check on the tag
creation into the steps that create the release/upload the assets.

This allows us to ensure we're always in a releaseable state.

Signed-off-by: Rob Bradford <robert.bradford@intel.com>
(cherry picked from commit ef7e177df2ffd9233eec6870ace5152217ef8d38)
Signed-off-by: Bo Chen <chen.bo@intel.com>

.github/workflows/release.yaml

@@ -1,9 +1,8 @@
 name: Cloud Hypervisor Release
-on: [create]
+on: [pull_request, create]
 
 jobs:
   release:
-    if: github.event_name == 'create' && github.event.ref_type == 'tag'
     name: Release
     runs-on: ubuntu-latest
     steps:
@@ -55,6 +54,7 @@ jobs:
           mkdir .cargo
           cargo vendor > .cargo/config.toml
       - name: Create Release
+        if: github.event_name == 'create' && github.event.ref_type == 'tag'
         id: create_release
         uses: actions/create-release@v1
         env:
@@ -68,6 +68,7 @@ jobs:
         working-directory: ../
         run: tar cJf cloud-hypervisor-${{ github.event.ref }}.tar.xz cloud-hypervisor-${{ github.event.ref }}
       - name: Upload cloud-hypervisor vendored source archive
+        if: github.event_name == 'create' && github.event.ref_type == 'tag'
         id: upload-release-cloud-hypervisor-vendored-sources
         uses: actions/upload-release-asset@v1
         env:
@@ -78,6 +79,7 @@ jobs:
           asset_name: cloud-hypervisor-${{ github.event.ref }}.tar.xz
           asset_content_type: application/x-xz
       - name: Upload cloud-hypervisor
+        if: github.event_name == 'create' && github.event.ref_type == 'tag'
         id: upload-release-cloud-hypervisor
         uses: actions/upload-release-asset@v1
         env:
@@ -88,6 +90,7 @@ jobs:
           asset_name: cloud-hypervisor
           asset_content_type: application/octet-stream
       - name: Upload static cloud-hypervisor
+        if: github.event_name == 'create' && github.event.ref_type == 'tag'
         id: upload-release-static-cloud-hypervisor
         uses: actions/upload-release-asset@v1
         env:
@@ -98,6 +101,7 @@ jobs:
           asset_name: cloud-hypervisor-static
           asset_content_type: application/octet-stream
       - name: Upload ch-remote
+        if: github.event_name == 'create' && github.event.ref_type == 'tag'
         id: upload-release-ch-remote
         uses: actions/upload-release-asset@v1
         env:
@@ -108,6 +112,7 @@ jobs:
           asset_name: ch-remote
           asset_content_type: application/octet-stream
       - name: Upload static-ch-remote
+        if: github.event_name == 'create' && github.event.ref_type == 'tag'
         id: upload-release-static-ch-remote
         uses: actions/upload-release-asset@v1
         env:
@@ -118,6 +123,7 @@ jobs:
           asset_name: ch-remote-static
           asset_content_type: application/octet-stream
       - name: Upload static AArch64 cloud-hypervisor
+        if: github.event_name == 'create' && github.event.ref_type == 'tag'
         id: upload-release-static-aarch64-cloud-hypervisor
         uses: actions/upload-release-asset@v1
         env:
@@ -128,6 +134,7 @@ jobs:
           asset_name: cloud-hypervisor-static-aarch64
           asset_content_type: application/octet-stream
       - name: Upload static AArch64 ch-remote
+        if: github.event_name == 'create' && github.event.ref_type == 'tag'
         id: upload-release-static-aarch64-ch-remote
         uses: actions/upload-release-asset@v1
         env: