Push function-kcl to GHCR

Signed-off-by: Nic Cope <nicc@rk0n.org>

Author: negz

.github/workflows/ci.yaml

@@ -33,6 +33,7 @@ env:
   # The package to push, without a version tag. The default matches GitHub. For
   # example xpkg.upbound.io/crossplane/function-template-go.
   XPKG: xpkg.upbound.io/${{ github.repository}}
+  CROSSPLANE_REGORG: ghcr.io/${{ github.repository}} # xpkg.crossplane.io/crossplane-contrib
 
   # The package version to push. The default is 0.0.0-gitsha.
   XPKG_VERSION: v0.11.3
@@ -167,3 +168,14 @@ jobs:
       - name: Push Latest Package to Upbound
         if: env.XPKG_ACCESS_ID != ''
         run: "./crossplane --verbose xpkg push --package-files $(echo *.xpkg|tr ' ' ,) ${{ env.XPKG }}:latest"
+
+      - name: Login to GHCR
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Push Multi-Platform Package to GHCR
+        run: "./crossplane --verbose xpkg push --package-files $(echo *.xpkg|tr ' ' ,) ${{ env.CROSSPLANE_REGORG }}:${{ env.XPKG_VERSION }}"
+