update singularity latest tag on release

Author: cbaker6

.github/workflows/image-release.yml

@@ -119,3 +119,60 @@ jobs:
                 echo ${{ secrets.GITHUB_TOKEN }} | singularity remote login -u ${{ secrets.GHCR_USERNAME }} --password-stdin oras://ghcr.io
                 singularity push container.sif oras://ghcr.io/${GITHUB_REPOSITORY}:${tag}
             fi
+
+  singularity-latest:
+    needs: docker
+    runs-on: ubuntu-latest
+    container:
+      image: quay.io/singularity/singularity:v3.10.4
+    strategy:
+      fail-fast: false
+      matrix:
+        recipe: ["Singularity"]
+
+    name: Check ${{ matrix.recipe }}
+    steps:
+
+      - name: Check out code for the container build
+        uses: actions/checkout@v3
+
+      - name: Continue if Singularity Recipe Exists
+        run: |
+          if [[ -f "${{ matrix.recipe }}" ]]; then
+            echo "keepgoing=true" >> $GITHUB_ENV
+          fi
+
+      - name: Create tag for Singularity
+        env:
+          recipe: ${{ matrix.recipe }}
+        run: |
+         ls
+         if [ -f "${{ matrix.recipe }}" ]; then
+            sudo -E singularity build container.sif ${{ matrix.recipe }}
+            tag=$(echo "${recipe/Singularity\./}")
+            if [ "$tag" == "Singularity" ]; then
+                tag=latest
+            fi
+            # Build the container and name by tag
+            echo "Tag is $tag."
+            echo "tag=$tag" >> $GITHUB_ENV
+         else
+           echo "${{ matrix.recipe }} is not found."
+           echo "Present working directory: $PWD"
+           ls
+         fi
+
+      - name: Update Singularity file tag
+        run: |
+          sed -i "s/latest/$tag/" ./Singularity
+
+      - name: Login and Deploy Container
+        #if: (github.event_name != 'pull_request')
+        env:
+          keepgoing: ${{ env.keepgoing }}
+        run: |
+            if [[ "${keepgoing}" == "true" ]]; then
+                echo ${{ secrets.GITHUB_TOKEN }} | singularity remote login -u ${{ secrets.GHCR_USERNAME }} --password-stdin oras://ghcr.io
+                singularity push container.sif oras://ghcr.io/${GITHUB_REPOSITORY}:${tag}
+            fi
+