Fix GIT_COMMIT_HASH not set in Flatpak builds (#12725)

The env var check was gated inside the .git directory check, so
Flatpak builds (which exclude .git from the sandbox) always fell
back to "0000000". Lift the env var check to top level and inject
the commit hash into the Flatpak manifest via build-options.env.

.github/workflows/build_all.yml

@@ -170,7 +170,7 @@ jobs:
           git_commit_hash="${{ github.event.pull_request.head.sha }}"
         else
           ver=V$ver_pure
-          git_commit_hash=""
+          git_commit_hash="${{ github.sha }}"
         fi
         echo "ver=$ver" >> $GITHUB_ENV
         echo "ver_pure=$ver_pure" >> $GITHUB_ENV
@@ -197,6 +197,11 @@ jobs:
         sed -i '0,/^finish-args:/s//build-options:\n  no-debuginfo: true\n  strip: true\nfinish-args:/' \
           scripts/flatpak/io.github.orcaslicer.OrcaSlicer.yml
       shell: bash
+    - name: Inject git commit hash into Flatpak manifest
+      run: |
+        sed -i "/name: OrcaSlicer/{n;s|buildsystem: simple|buildsystem: simple\n    build-options:\n      env:\n        git_commit_hash: \"$git_commit_hash\"|}" \
+          scripts/flatpak/io.github.orcaslicer.OrcaSlicer.yml
+      shell: bash
     - uses: flatpak/flatpak-github-actions/flatpak-builder@master
       with:
         bundle: OrcaSlicer-Linux-flatpak_${{ env.ver }}_${{ matrix.variant.arch }}.flatpak

CMakeLists.txt

@@ -89,10 +89,9 @@ else ()
 endif ()
 
 find_package(Git)
-if(GIT_FOUND AND EXISTS "${CMAKE_SOURCE_DIR}/.git")
-    if(DEFINED ENV{git_commit_hash} AND NOT "$ENV{git_commit_hash}" STREQUAL "")
-        message(STATUS "Specified git commit hash: $ENV{git_commit_hash}")
-
+if(DEFINED ENV{git_commit_hash} AND NOT "$ENV{git_commit_hash}" STREQUAL "")
+    message(STATUS "Specified git commit hash: $ENV{git_commit_hash}")
+    if(GIT_FOUND AND EXISTS "${CMAKE_SOURCE_DIR}/.git")
         # Convert the given hash to short hash
         execute_process(
             COMMAND ${GIT_EXECUTABLE} rev-parse --short "$ENV{git_commit_hash}"
@@ -100,17 +99,20 @@ if(GIT_FOUND AND EXISTS "${CMAKE_SOURCE_DIR}/.git")
             OUTPUT_VARIABLE GIT_COMMIT_HASH
             OUTPUT_STRIP_TRAILING_WHITESPACE
         )
-        add_definitions("-DGIT_COMMIT_HASH=\"${GIT_COMMIT_HASH}\"")
     else()
-        # Check current Git commit hash
-        execute_process(
-            COMMAND ${GIT_EXECUTABLE} log -1 --format=%h
-            WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
-            OUTPUT_VARIABLE GIT_COMMIT_HASH
-            OUTPUT_STRIP_TRAILING_WHITESPACE
-        )
-        add_definitions("-DGIT_COMMIT_HASH=\"${GIT_COMMIT_HASH}\"")
+        # No .git directory (e.g., Flatpak sandbox) — truncate directly
+        string(SUBSTRING "$ENV{git_commit_hash}" 0 7 GIT_COMMIT_HASH)
     endif()
+    add_definitions("-DGIT_COMMIT_HASH=\"${GIT_COMMIT_HASH}\"")
+elseif(GIT_FOUND AND EXISTS "${CMAKE_SOURCE_DIR}/.git")
+    # Check current Git commit hash
+    execute_process(
+        COMMAND ${GIT_EXECUTABLE} log -1 --format=%h
+        WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
+        OUTPUT_VARIABLE GIT_COMMIT_HASH
+        OUTPUT_STRIP_TRAILING_WHITESPACE
+    )
+    add_definitions("-DGIT_COMMIT_HASH=\"${GIT_COMMIT_HASH}\"")
 endif()
 
 if(DEFINED ENV{SLIC3R_STATIC})