Add basic CI via GitHub actions.

Author: ivucica

.github/workflows/build.yml

@@ -0,0 +1,75 @@
+name: Build GNUstep (CI)
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build-linux:
+    name: Build on Ubuntu
+    runs-on: ubuntu-latest
+    timeout-minutes: 180
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Prepare gnustep workspace
+        shell: bash
+        run: |
+          # Create the layout expected by the scripts: a 'gnustep' parent directory
+          mkdir -p gnustep
+          # Copy repository contents into gnustep/tools-scripts (exclude the .git directory to avoid nested git issues)
+          rsync -a --exclude '.git' ./ gnustep/tools-scripts/
+          ls -la gnustep/tools-scripts | sed -n '1,200p'
+
+      - name: Clone GNUStep repositories (HTTPS)
+        shell: bash
+        run: |
+          set -euo pipefail
+          cd gnustep
+          FILES="libs-back libs-gui apps-projectcenter libs-palettes libs-boron apps-easydiff libs-opal libs-ec libs-mica libs-webservices libobjc2 libs-performance libs-base libs-sqlclient libs-corebase libs-dbuskit gitsvn-scripts plugins-themes-WinUXTheme plugins-themes-Gtk plugins-session plugins-gs-emacs libs-gscoredata apps-thematic apps-systempreferences tools-android android-examples tools-windows-development-installer tools-startup libs-gsweb tools-nfmake tools-installers tests-testsuite tests-retaincount tests-palettetest tests-gormtest libs-webserver libs-uikit libs-ucsdata libs-sysconfig apps-interfacecreator tests-examples libs-xcode libs-steptalk libs-smbkit libs-simplewebkit libs-ruby libs-renaissance libs-quartzcore libs-ppd libs-java libs-guile libs-gsldap libs-gsgd libs-gscrypt libs-gsantlr libs-gdl2 libs-corenetwork libs-coreimage gap libs-audiotoolbox apps-gworkspace apps-gsldapwebexplorer apps-gorm tools-make tools-scripts tools-model-main tools-charsets plugins-deprecated license libobjc webkit-cef apps-dock tools-bridge plugins-themes tools-windows-msvc"
+
+          for repo in $FILES; do
+            echo "Processing $repo"
+            if [ -d "$repo" ]; then
+              echo "Updating existing $repo"
+              git -C "$repo" pull origin master || true
+            else
+              git clone --recursive "https://github.com/gnustep/$repo.git" || true
+            fi
+          done
+
+      - name: Make scripts executable
+        shell: bash
+        run: |
+          cd gnustep/tools-scripts || exit 1
+          chmod +x ./* || true
+
+      - name: Install dependencies (Linux)
+        shell: bash
+        run: |
+          set -euo pipefail
+          cd gnustep
+          # The install script will call apt/yum as appropriate. Use sudo in the runner.
+          sudo ./tools-scripts/install-dependencies-linux || true
+
+      - name: Build GNUstep (clang)
+        shell: bash
+        env:
+          WITH_ARC: ""
+        run: |
+          set -euo pipefail
+          cd gnustep
+          # Build using the repository scripts. This follows the README's build steps.
+          ./tools-scripts/build-linux
+
+      - name: Post-install steps
+        shell: bash
+        run: |
+          set -euo pipefail
+          cd gnustep
+          ./tools-scripts/post-install-linux || true