allow limit to single arch

.github/workflows/build.yml

@@ -10,7 +10,17 @@ on:
       - 'Makefile*'
       - 'make_debian.sh'
       - 'contrib/docker/**'
-
+  workflow_dispatch:
+    inputs:
+      limitarch:
+        description: Limit to this architecture
+        required: false
+        type: choice
+        options:
+          - amd64
+          - '386'
+          - arm/v7
+          - arm64
 jobs:
   build:
     runs-on: ubuntu-latest
@@ -35,4 +45,4 @@ jobs:
           password: ${{ secrets.DOCKERHUB_TOKEN }}
       -
         name: build
-        run: cd contrib/docker && ./build.sh
+        run: cd contrib/docker && LIMITARCH=${{ inputs.limitarch }} ./build.sh

contrib/docker/build.sh

@@ -7,6 +7,9 @@ if [[ "$1" == "-h" ]]; then
   exit 1
 fi
 archs=linux/amd64,linux/386,linux/arm/v7,linux/arm64
+if [[ -n "$LIMITARCH" ]]; then
+  archs=$(echo ",$archs," | sed -e "s#.*,\([^,/]*/$LIMITARCH\),.*#\1#")
+fi
 if [[ -z "$1" ]] || [[ "x$1" == "xrelease" ]]; then
   UPLOAD_URL=
 elif [[ -z "$UPLOAD_URL" ]]; then