.github/workflows/ci-sage.yml: TMP: Build against passagemath/passagemath#815

Author: mkoeppe

.github/workflows/ci-sage.yml

@@ -92,7 +92,8 @@ jobs:
       targets: SAGE_CHECK=no SAGE_CHECK_PACKAGES="macaulay2" macaulay2
       # Standard setting: Test the current HEAD of passagemath:
       sage_repo: passagemath/passagemath
-      sage_ref: main
+      #sage_ref: main
+      sage_ref: refs/pull/815/merge
       upstream_artifact: upstream
       # We prefix the image name with the SPKG name ("macaulay2-") to avoid the error
       # 'Package "sage-docker-..." is already associated with another repository.'
@@ -106,7 +107,8 @@ jobs:
       targets: SAGE_CHECK=no SAGE_CHECK_PACKAGES="macaulay2" macaulay2
       # Standard setting: Test the current HEAD of passagemath:
       sage_repo: passagemath/passagemath
-      sage_ref: main
+      #sage_ref: main
+      sage_ref: refs/pull/815/merge
       upstream_artifact: upstream
     needs: [dist]
 
@@ -116,7 +118,8 @@ jobs:
       targets: SAGE_CHECK=no SAGE_CHECK_PACKAGES="sagemath_macaulay2" sagemath_macaulay2
       # Standard setting: Test the current HEAD of passagemath:
       sage_repo: passagemath/passagemath
-      sage_ref: main
+      #sage_ref: main
+      sage_ref: refs/pull/815/merge
       upstream_artifact: upstream
       # Build incrementally from published Docker image
       incremental: true