Fix GPU wheel Docker image and add FloodFill/MLMG solver tests

[jameslehoux]

• Fix GPU wheel CI: use sameli/manylinux_2_34_x86_64_cuda_12.6 (the manylinux_2_28 variant with CUDA 12.6 does not exist on Docker Hub)
• Update dnf repo from 'powertools' to 'crb' for RHEL 9-based image
• Add tFloodFill integration test: validates parallelFloodFill and collectBoundarySeeds with 4 test cases (full flood, partial flood, boundary seeds, multi-label)
• Add tTortuosityMLMG integration test: validates MLMG matrix-free solver against analytical tau=(N-1)/N on uniform block, with directional symmetry test (Y direction)

https://claude.ai/code/session_01WR9HkUD95rp3XzZU95j2y7

[github-actions]

Code Coverage Report

------------------------------------------------------------------------------
                           GCC Code Coverage Report
Directory: .
------------------------------------------------------------------------------
File                                       Lines     Exec  Cover   Missing
------------------------------------------------------------------------------
src/io/CathodeWrite.cpp                       95       83    87%   40-41,97-100,115-116,182-185
src/io/CathodeWrite.H                          1        1   100%
src/io/DatReader.cpp                         135      105    77%   26-27,30,35,92-93,99-100,107-109,135-137,141,144-148,152-155,162,164,208-209,242,245
src/io/DatReader.H                             1        1   100%
src/io/HDF5Reader.cpp                        344       84    24%   40-41,43-44,46-49,52,54-56,58-59,62,64-66,68-74,92-93,126-128,144-145,154-157,174-180,182-187,204,213-215,217,219-228,230-233,236-238,240-251,253-258,266,266,266,266,266,266,266,270,270,270,270,270,270,270,274,276,278,280,282,288,290,297,297,297,297,297,297,297,301,301,301,301,301,301,301,305,305,305,305,305,305,305-306,306,306,306,306,306,306,309,309,309,309,309,309,309-310,310,310,310,310,310,310-311,311,311,311,311,311,311,313,313,313,313,313,313,313-314,314,314,314,314,314,314-315,315,315,315,315,315,315,319,319,319,319,319,319,319,324,324,324,324,324,324,324-325,325,325,325,325,325,325-326,326,326,326,326,326,326-327,327,327,327,327,327,327,332,332,332,332,332,332,332,337,337,337,337,337,337,337-338,338,338,338,338,338,338,343,343,343,343,343,343,343,350,350,350,350,350,350,350,357-358,432-435,437-440
src/io/HDF5Reader.H                            3        3   100%
src/io/ImageLoader.cpp                        61       42    68%   25,38,48,60-62,64-70,72,77,89-90,92,94
src/io/RawReader.cpp                         266      116    43%   49-50,89-90,111-112,115-117,120-121,140-142,155-157,166-168,174-177,185-186,192-196,200-204,209-212,219-224,231-237,259,263-264,270-271,273-274,276,283-284,301,312,314,318,325,327,331-334,338,346-347,353-355,361-363,365-366,369,372,374,377-380,382-384,386,388-389,391,393-394,396,398-399,401,403-404,406,410-411,413,417-418,420,425,457,463-465,471-472,521-524,526,528-530,532,534-536,538,540-542,544,546-548,550,554-556,558,562-564,566,588
src/io/RawReader.H                             1        1   100%
src/io/TiffReader.cpp                        384      130    33%   59-65,67-69,71-73,75-77,79-80,82-84,86-88,90-92,94-96,98-99,101-103,106-108,111-112,114-117,119,122,124-127,143-144,148-150,152-158,160,186,210,217,226,228-231,240,242-245,248,255,288-293,306,309-317,319-320,323-327,331-335,338-342,344-348,351-357,359-363,367,369,375-377,379-393,396,398-402,404-409,413-418,420-425,428-429,432-434,555-575,577-578,581-588,590,593-609,612-614,670,673-674,677-683,685,689-700,702-703
src/io/TiffReader.H                            5        5   100%
src/props/BoundaryCondition.H                131       74    56%   63,68,70,216,224-229,233-236,238-244,247-249,252-253,255,258-261,264-265,271-272,274-279,285-287,290-296,299,303,365-366,371,373
src/props/ConnectedComponents.cpp             69       67    97%   94-95
src/props/ConnectedComponents.H                4        4   100%
src/props/DeffTensor.cpp                      62       59    95%   122,128-129
src/props/Diffusion.cpp                      510      245    48%   69,73,75-80,82-87,89-90,93-94,97-98,103-104,106-116,118,123-132,134-141,144-150,153-157,159-163,165,168-173,175-177,179,182-184,186-187,190-191,193,195-198,200,202-203,205,288-289,297-298,300,349,359-360,368-371,373-375,404-413,415,453,461,465-467,475,482-483,487-488,490-493,496-497,499-504,507-509,513-516,518-522,524-527,529-537,539,543,545,547,551,553-555,559-564,567,571,573-574,576,578-581,584-591,594,597-601,603-607,609-610,614,617-618,620-622,624-625,627-633,636,638,642-644,646,648-649,735-736,739-740,757-760,771-772,774,786-787,789,791-792,794-801,803-804,818-819,824
src/props/EffDiffFillMtx.H                   120      106    88%   58,216-217,221-225,229,231-235
src/props/EffectiveDiffusivityHypre.cpp      387      345    89%   213-215,217-221,303,365-368,477,610-613,615-617,619-622,631-634,641,670,682-685,687-689,691,703,714-715
src/props/EffectiveDiffusivityHypre.H          7        7   100%
src/props/FloodFill.cpp                       84       82    97%   94-95
src/props/HypreStructSolver.cpp              343      210    61%   87-88,121,133-134,145,299,309,311,314,346,356,358,361,367-370,372-376,378-379,381-385,388-389,391-392,394,397-398,401-402,404-407,409-413,415-416,418-422,425-426,428-429,431,434-435,438-439,441-443,445-451,453-457,460-461,463-464,466,469-470,473,475-477,479-485,487-491,494-495,497-498,500,503-504,507,509-511,513-516,518-522,525-526,528-529,531,534-535,538,541-542,555
src/props/HypreStructSolver.H                  6        6   100%
src/props/MacroGeometry.H                     17       17   100%
src/props/ParticleSizeDistribution.cpp        11       11   100%
src/props/ParticleSizeDistribution.H           6        6   100%
src/props/PercolationCheck.cpp                53       46    86%   32-33,49-51,68,73
src/props/PercolationCheck.H                   4        4   100%
src/props/PhysicsConfig.H                     90       89    98%   150
src/props/ResultsJSON.H                      225      222    98%   242,395,416
src/props/REVStudy.cpp                       151        0     0%   27,32,34-40,42-44,47,49,53-56,58,62,64-65,67-72,74-75,79-80,82-91,93-96,100-101,103,106-109,111-114,120-124,127-136,139-141,143,146-147,149,152-156,158-159,161,163,165-173,175,177-186,188-191,195-197,201,203-204,206,209-222,225-231,233-234,236-237,239-241,243,246-247,249
src/props/SolverConfig.H                      32       20    62%   30,32,37-44,75-76
src/props/SpecificSurfaceArea.cpp             56       55    98%   59
src/props/SpecificSurfaceArea.H                6        6   100%
src/props/ThroughThicknessProfile.cpp         35       35   100%
src/props/ThroughThicknessProfile.H            5        5   100%
src/props/Tortuosity.H                         2        2   100%
src/props/TortuosityDirect.cpp               219      191    87%   81-83,86,100-106,113-114,125,134,140,202-209,226,394,424,433
src/props/TortuosityDirect.H                   5        5   100%
src/props/TortuosityHypre.cpp                779      559    71%   148-149,154-155,276-279,282-284,329-331,334-335,337,347-349,352-354,384-387,567,591,595,616,632-633,635-637,639-648,650,653-657,661-663,666-673,675-679,683-685,687-689,691-700,702-706,708-719,721-724,726,736,742-745,747-749,758-761,763-765,781,784-785,808-813,824-827,829,866,871-874,877-879,883-886,888,890-893,895,900-902,904,953,962,967,970-975,991-994,1008-1012,1017-1022,1032-1036,1041-1046,1051-1055,1058-1061,1068-1071,1082,1091,1093,1097,1099,1121,1152-1153,1239-1241,1367-1370
src/props/TortuosityHypre.H                   15       15   100%
src/props/TortuosityHypreFill.H              127       98    77%   85,203,205-212,237-239,241-245,247-248,250,252,255-256,258-262
src/props/TortuosityKernels.H                 97       53    54%   52,56-60,62-65,69-74,76-80,84-85,90,129,143,157,243,245-248,250-253,257-260,262-265
src/props/TortuosityMLMG.cpp                  96       88    91%   153,174-176,178-179,186,199
src/props/TortuosityMLMG.H                     1        1   100%
src/props/TortuositySolverBase.cpp           301      231    76%   70-72,74-75,94-101,104,106,142-145,200,203,205,255,280,295-296,298,324-325,327,391,394-396,398,406-409,411-417,422,427-429,435-436,438-440,454,460,464-465,467,475-476,478,492,496-498,500,502,506
src/props/TortuositySolverBase.H              13       13   100%
src/props/VolumeFraction.cpp                  25       25   100%
src/props/VolumeFraction.H                     4        4   100%
------------------------------------------------------------------------------
TOTAL                                       5394     3577    66%
------------------------------------------------------------------------------

---

Generated by CI — coverage data from gcovr

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

📢 Thoughts on this report? Let us know!