Try force conda-forge gcc_linux

Author: shuds13

.github/workflows/basic.yml

@@ -72,7 +72,7 @@ jobs:
         - name: Install Ubuntu compilers
           if: matrix.os == 'ubuntu-latest'
           run: |
-              conda install gcc_linux-64
+              conda install -c conda-forge gcc_linux-64
               pip install nlopt==2.9.0
 
         # Roundabout solution on macos for proper linking with mpicc

.github/workflows/extra.yml

@@ -75,7 +75,7 @@ jobs:
         - name: Install Ubuntu compilers
           if: matrix.os == 'ubuntu-latest'
           run: |
-            conda install gcc_linux-64
+            conda install -c conda-forge gcc_linux-64
             pip install nlopt==2.9.0
 
         # Roundabout solution on macos for proper linking with mpicc