Add first attempt at singularity file generation

Author: stewartboogert

.github/workflows/buildapptainers.yaml

@@ -0,0 +1,54 @@
+name: build bdsim apptainers
+
+on:
+  release:
+    types:
+      - published
+
+jobs:
+
+  apptainer-bdsim:
+    name: build apptainer images from docker images
+    runs-on: ubuntu-latest
+    container: bdsim/alma9-apptainer
+
+    strategy:
+      fail-fast: false
+      matrix:
+        bdsim: [alma9-g4.10.7-bdsim, alma9-g4.11.0-bdsim,
+                alma9-g4.11.1-bdsim, alma9-g4.11.2-bdsim,
+                alma9-g4.11.3-bdsim]
+
+    steps:
+      - name: Dump job context
+        env:
+          JOB_CONTEXT: ${{ toJson(job) }}
+        run: echo "$JOB_CONTEXT"
+
+      - name: Check out the repo
+        uses: actions/checkout@v4
+
+      - name: Flatten bdsim containers
+        shell: bash
+        run: |
+          singularity build ${{ bdsim }}_develop.sif docker:bdsim/${{ bdsim }}:develop
+          
+      - name: Create Release
+        id: create_release
+        uses: ncipollo/release-action@v1
+        with:
+          name: Release ${{ github.ref }}
+          token: ${{ secrets.GITHUB_TOKEN }}
+          draft: false
+          prerelease: false
+          allowUpdates: true
+
+      - name: Upload Release Asset
+        id: upload-release-asset
+        uses: actions/upload-release-asset@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          upload_url: ${{ steps.create_release.outputs.upload_url }}
+          asset_path: ./${{ bdsim }}_develop.sif
+          asset_name: ${{ bdsim }}_develop.sif