CI: Add LFortran

Author: bonachea

.github/workflows/build.yml

@@ -73,6 +73,14 @@ jobs:
             error_stop_code: 128
             container: intel/fortran-essentials:2025.0.0-0-devel-ubuntu22.04 
 
+          # --- LFortran coverage ---
+
+          # https://hub.docker.com/r/phhargrove/lfortran/tags
+          - os: ubuntu-24.04
+            compiler: lfortran
+            version: 0.54.0
+            container: phhargrove/lfortran:0.54.0-1
+
     container:
       image: ${{ matrix.container }}
 
@@ -122,6 +130,9 @@ jobs:
           echo "FPM_FC=flang-new" >> "$GITHUB_ENV" ; \
         elif test "$FC" = "ifx" ; then \
           echo "FPM_FC=ifx" >> "$GITHUB_ENV" ; \
+        elif test "$FC" = "lfortran" ; then \
+          echo "FPM_FC=lfortran" >> "$GITHUB_ENV" ; \
+          echo "FFLAGS=--cpp $FFLAGS" >> "$GITHUB_ENV" ; \
         else \
           echo "FPM_FC=gfortran-${COMPILER_VERSION}" >> "$GITHUB_ENV" ; \
           echo "FFLAGS=-ffree-line-length-0 $FFLAGS" >> "$GITHUB_ENV" ; \