release: Add a step to get the release tags

GitHub actions is fun and always willing to play tricks with us.  This
nice little kid decided that `echo "FOO=\"bar zaz\"" >> $GITHUB_ENV` is
not valid, and it simply breaks things in a way that is a pain to debug.

But hey, we take this path, and after doing so I realised that the
correct way to export that is `echo "FOO=bar zaz" >> $GITHUB_ENV`.

I know, this looks incorrect, but this fellow never stops surprising us.

Signed-off-by: Fabiano Fidêncio <fabiano.fidencio@intel.com>

.github/workflows/release.yaml

@@ -81,11 +81,13 @@ jobs:
           username: ${{ secrets.QUAY_DEPLOYER_USERNAME }}
           password: ${{ secrets.QUAY_DEPLOYER_PASSWORD }}
 
+      - name: Get the image tags
+        run: |
+          release_version=$(./tools/packaging/release/release.sh next-release-version)
+          echo "KATA_DEPLOY_IMAGE_TAGS=$release_version latest" >> "$GITHUB_ENV"
+
       - name: Push multi-arch manifest
         run: |
-          tags="$(cat VERSION) latest"
-          echo "KATA_DEPLOY_IMAGE_TAGS=\"${tags}\"" >> "$GITHUB_ENV"
-
           ./tools/packaging/release/release.sh publish-multiarch-manifest
         env:
           KATA_DEPLOY_REGISTRIES: "quay.io/kata-containers/kata-deploy docker.io/katadocker/kata-deploy"