ci(appimage): add aarch64 build (Raspberry Pi / ARM)

.github/workflows/appimage.yml

@@ -1,6 +1,7 @@
 name: Linux AppImage
 
-# A portable Linux binary that runs on any reasonably modern x86_64 distro
+# A portable Linux binary that runs on any reasonably modern x86_64 or aarch64
+# distro
 # without installing dependencies -- the Linux counterpart to the Windows
 # portable zip. Needs no secrets of any kind.
 #
@@ -21,7 +22,16 @@ permissions:
 
 jobs:
   appimage:
-    runs-on: ubuntu-22.04
+    name: AppImage (${{ matrix.arch }})
+    runs-on: ${{ matrix.runner }}
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - arch: x86_64
+            runner: ubuntu-22.04
+          - arch: aarch64
+            runner: ubuntu-22.04-arm
 
     steps:
       - name: Checkout
@@ -78,12 +88,12 @@ jobs:
           install -Dm644 COPYING AppDir/usr/share/doc/fldigi/COPYING
 
           cat > AppDir/usr/share/doc/fldigi/BUILD-INFO.txt <<EOF
-          fldigi ${VERSION} with TCI - Linux x86_64 AppImage
+          fldigi ${VERSION} with TCI - Linux ${{ matrix.arch }} AppImage
 
           Commit:     $(git rev-parse HEAD)
           Source:     ${{ github.server_url }}/${{ github.repository }}
           Built by:   GitHub Actions run ${{ github.run_id }}
-          Built on:   ubuntu-22.04 (glibc floor), FLTK $(fltk-config --version)
+          Built on:   ${{ matrix.runner }} (glibc floor), FLTK $(fltk-config --version)
 
           Unofficial build of a fork. Report TCI problems to
           ${{ github.server_url }}/${{ github.repository }}/issues - NOT to the
@@ -99,13 +109,13 @@ jobs:
           # .AppImage, so leaving it next to the build output makes any
           # *.AppImage glob match the build tool as well as the product -- which
           # would quietly attach linuxdeploy to a GitHub release.
-          LD="${RUNNER_TEMP}/linuxdeploy-x86_64.AppImage"
-          wget -q -O "$LD" https://github.com/linuxdeploy/linuxdeploy/releases/download/continuous/linuxdeploy-x86_64.AppImage
+          LD="${RUNNER_TEMP}/linuxdeploy-${{ matrix.arch }}.AppImage"
+          wget -q -O "$LD" https://github.com/linuxdeploy/linuxdeploy/releases/download/continuous/linuxdeploy-${{ matrix.arch }}.AppImage
           chmod +x "$LD"
           # The runner has no FUSE, so the AppImage tools cannot mount
           # themselves; --appimage-extract-and-run is the documented escape.
           export APPIMAGE_EXTRACT_AND_RUN=1
-          export OUTPUT="fldigi-${{ steps.stage.outputs.version }}-tci-x86_64.AppImage"
+          export OUTPUT="fldigi-${{ steps.stage.outputs.version }}-tci-${{ matrix.arch }}.AppImage"
           "$LD" \
             --appdir AppDir \
             --desktop-file AppDir/usr/share/applications/fldigi.desktop \
@@ -117,7 +127,7 @@ jobs:
       - name: Verify the AppImage actually runs
         run: |
           set -euo pipefail
-          APP="fldigi-${{ steps.stage.outputs.version }}-tci-x86_64.AppImage"
+          APP="fldigi-${{ steps.stage.outputs.version }}-tci-${{ matrix.arch }}.AppImage"
           chmod +x "$APP"
           # Running it proves the bundle resolves its own libraries -- a green
           # build with a missing lib is the classic silent AppImage failure.
@@ -128,7 +138,7 @@ jobs:
       - name: Upload artifact
         uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4
         with:
-          name: fldigi-${{ steps.stage.outputs.version }}-linux-x86_64-AppImage
+          name: fldigi-${{ steps.stage.outputs.version }}-linux-${{ matrix.arch }}-AppImage
           path: fldigi-*.AppImage
           if-no-files-found: error
           retention-days: 90