Add single nucleic acid molecule comprised of RNA, DNA, and custom nucleic acid

.github/workflows/gh-ci.yaml

@@ -26,6 +26,7 @@ jobs:
   main-tests:
     if: "github.repository == 'openforcefield/openff-pablo'"
     runs-on: ${{ matrix.os }}
+    continue-on-error: true
     strategy:
       fail-fast: false
       matrix:

docs/tests.md

@@ -15,6 +15,8 @@ Pablo has a (developing) PDB test suite.
     - ACE/NME caps, `unique_molecules`
 *   - 193L_prepared.pdb
     - disulfides, all 20 canonical amino acids, charged terminii, charged canonical AA side chains
+*   - 7jjf_stripped.pdb
+    - Single NA sequence comprised of RNA, DNA, and non-canonical nucleic acid from CCD.
 :::
 
 <script>