Disable tests if no secret exists

.github/workflows/github.yml

@@ -73,7 +73,6 @@ jobs:
             test: 0
             preset: linux-clang-test
           - platform: linux
-
             os: ubuntu-22.04
             test: 1
             preset: linux-gcc-test
@@ -208,9 +207,9 @@ jobs:
         verbose: 2
 
     - name: Clone Heroes 3 data
-      if: ${{ startsWith(matrix.preset, 'linux') && endsWith(matrix.preset, 'test') }}
       env:
         HEROES_3_DATA_PASSWORD: ${{ secrets.HEROES_3_DATA_PASSWORD }}
+      if: ${{ env.HEROES_3_DATA_PASSWORD != '' && matrix.test == 1 }}
       run: |
         wget --progress=dot:giga https://github.com/vcmi-mods/vcmi-test-data/releases/download/v1.0/h3_assets.zip
         7za x h3_assets.zip -p$HEROES_3_DATA_PASSWORD
@@ -263,7 +262,9 @@ jobs:
         cmake --build --preset ${{matrix.preset}}
 
     - name: Test
-      if: ${{ matrix.test == 1 }}
+      env:
+        HEROES_3_DATA_PASSWORD: ${{ secrets.HEROES_3_DATA_PASSWORD }}
+      if: ${{ env.HEROES_3_DATA_PASSWORD != '' && matrix.test == 1 }}
       run: |
         ctest --preset ${{matrix.preset}}