GitHub Actions: use correct tag in assets.yml

We pass github.ref which have format refs/tags/%tag%. We can use this
format to download GitHub repository and checkout to specific branch,
however this format is not applicable to docker pull and rest of the
steps. Therefore we set up TAG environment variable in %tag% format
which is used in all steps after checking out and is derived from
git tag.

Signed-off-by: Pavel Abramov <[email protected]>

Author: uncleDecart

.github/workflows/assets.yml

@@ -55,7 +55,7 @@ jobs:
         run: |
           HV=kvm
           if [ "${{ github.event.repository.full_name }}" = "lf-edge/eve" ]; then
-             EVE=lfedge/eve:${{ inputs.tag_ref }}-${HV}-${{ env.ARCH }}
+             EVE=lfedge/eve:${TAG}-${HV}-${{ env.ARCH }}
              docker pull "$EVE"
           else
              make pkgs
@@ -66,7 +66,7 @@ jobs:
           docker run "$EVE" installer_net | tar -C assets -xvf -
       - name: Create direct iPXE config
         run: |
-          URL="${{ github.event.repository.html_url }}/releases/download/${{ inputs.tag_ref }}/${{ env.ARCH }}."
+          URL="${{ github.event.repository.html_url }}/releases/download/${TAG}/${{ env.ARCH }}."
           sed -i. -e '/# set url https:/s#^.*$#set url '"$URL"'#' assets/ipxe.efi.cfg
           for comp in initrd rootfs installer; do
               sed -i. -e "s#initrd=${comp}#initrd=${{ env.ARCH }}.${comp}#g" assets/ipxe.efi.cfg
@@ -84,7 +84,7 @@ jobs:
       - name: Pull eve-sources and publish collected_sources.tar.gz to assets
         run: |
           HV=kvm
-          EVE_SOURCES=lfedge/eve-sources:${{ inputs.tag_ref }}-${HV}-${{ env.ARCH }}
+          EVE_SOURCES=lfedge/eve-sources:${TAG}-${HV}-${{ env.ARCH }}
           docker pull "$EVE_SOURCES"
           docker create --name eve_sources "$EVE_SOURCES" bash
           docker export --output assets/collected_sources.tar.gz eve_sources
@@ -96,7 +96,7 @@ jobs:
           result-encoding: string
           script: |
             console.log(context)
-            tag = '${{ inputs.tag_ref }}'
+            tag = '${TAG}'
 
             // first create a release -- it is OK if that fails,
             // since it means the release is already there