Use ubuntu16.04 1.2 image in amd64 non alpine

.github/workflows/main.yaml

@@ -65,9 +65,9 @@ jobs:
       uses: actions/checkout@v4
     - name: Build binary
       run: |
-        docker run --rm --volume "${PWD}:/repo" ghcr.io/grycap/faas-supervisor-build:debian10-1.2 /bin/sh -c " \
+        docker run --rm --volume "${PWD}:/repo" ghcr.io/grycap/faas-supervisor-build:ubuntu16.04-1.2 /bin/sh -c " \
           cd /repo && \
-          pip3.9 install -r requirements.txt
+          pip3.8 install -r requirements.txt
           pyinstaller --onefile -n supervisor-bin faassupervisor/supervisor.py
           pyinstaller faassupervisor/supervisor.py
           cd dist
@@ -123,6 +123,8 @@ jobs:
       uses: docker/setup-qemu-action@v3
     - name: Set up Docker Buildx
       uses: docker/setup-buildx-action@v3
+    # if we use debian10-1.2 we have tls1.3 support but we lose old distros (glibc older than 2.31)
+    # if we use ubuntu16.04-1.1 we lose the tls1.3 support but use glibc version 2.23.
     - name: Build binary on emulated aarch64
       run: |
         docker run --rm --platform arm64 --volume "${PWD}:/repo" ghcr.io/grycap/faas-supervisor-build:debian10-1.2 /bin/sh -c " \