github CI: nightly builds for multiple distributions

Since the pipeline changed to use ucuntu22.04 runners, the nighty debian packages do not work on debian buster anymore.
    This change updates the pipeline to build for Ubuntu 20.04 and 22.04 as well as for
    Debian 10, 11 and 12.

    The distribution specific apt sources are as follows:

      "deb http://repo.aptly.info/nightly-bookworm bookworm main"

    (replace bookworm with focal, buster, bullseye. Install aptly repo key with: curl -fsS https://www.aptly.info/pubkey.txt | sudo gpg --dearmor -o /etc/apt/trusted.gpg.d/aptly.gpg)

    The builds on focal will also release to the legacy nightly apt repo: https://github.com/aptly-dev/aptly/actions/runs/8723898496/job/23933824692#step:7:24

    This only affects nightly builds, for now.
    Pipeline example: [](https://github.com/aptly-dev/aptly/actions/runs/8723898496)

.github/workflows/ci.yml

@@ -89,19 +89,61 @@ jobs:
           files: coverage.txt
 
   release:
-    name: release
     needs: build
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        name: [Ubuntu-20, Ubuntu-22, Debian-10, Debian-11, Debian-12]
+        include:
+          - name: Ubuntu-20
+            image: "ubuntu:20.04"
+            suite: focal
+            GOVER: '1.21'
+            install: "make ca-certificates git curl"
+          - name: Ubuntu-22
+            image: "ubuntu:22.04"
+            suite: jammy
+            install: "make ca-certificates git curl golang"
+          - name: Debian-10
+            image: "debian:buster"
+            suite: buster
+            GOVER: '1.21'
+            install: "make ca-certificates git curl"
+          - name: Debian-11
+            image: "debian:bullseye"
+            suite: bullseye
+            GOVER: '1.21'
+            install: "make ca-certificates git curl"
+          - name: Debian-12
+            image: "debian:bookworm"
+            suite: bookworm
+            install: "make ca-certificates git curl golang"
+    container:
+      image: ${{ matrix.image }}
+      env:
+        APT_LISTCHANGES_FRONTEND: none
+        DEBIAN_FRONTEND: noninteractive
     steps:
+      - name: Install O/S packages
+        run: |
+          apt-get update
+          apt-get install -y --no-install-recommends ${{ matrix.install }}
+          git config --global --add safe.directory "$GITHUB_WORKSPACE"
+          echo GOVER: ${{ env.GOVER }}
+
       - name: Checkout repository
         uses: actions/checkout@v3
         with:
-          # fetch the whole repot for `git describe` to
+          # fetch the whole repo for `git describe` to
           # work and get the nightly verion
           fetch-depth: 0
 
       - name: Setup Go
-        uses: actions/setup-go@v4
+        if: ${{ matrix.GOVER != '' }}
+        uses: actions/setup-go@v3
+        with:
+          go-version: ${{ matrix.GOVER }}
 
       - name: Make Release
         env:
@@ -115,7 +157,7 @@ jobs:
           APTLY_USER: ${{ secrets.APTLY_USER }}
           APTLY_PASSWORD: ${{ secrets.APTLY_PASSWORD }}
         run: |
-          ./upload-artifacts.sh nightly
+          ./upload-artifacts.sh nightly ${{ matrix.suite }}
 
       - name: Publish release to aptly
         if: startsWith(github.event.ref, 'refs/tags')
@@ -123,11 +165,4 @@ jobs:
           APTLY_USER: ${{ secrets.APTLY_USER }}
           APTLY_PASSWORD: ${{ secrets.APTLY_PASSWORD }}
         run: |
-          ./upload-artifacts.sh release
-
-      - name: Upload artifacts to GitHub Release
-        if: startsWith(github.event.ref, 'refs/tags')
-        uses: softprops/action-gh-release@v1
-        with:
-          body: Release ${{ github.ref }} generated by the CI.
-          files: build/*
+          ./upload-artifacts.sh release ${{ matrix.suite }}