Update matrixbuild to current Linux distributions (#50)

Debian 12, 11 and 10, Ubuntu 20.04 and 16.04, Fedora 34 and 33,
CentOS Stream 8 and CentOS Linux 7, Rocky Linux 8, Alpine Edge and
3.14.

Note: Especially CentOS containers are better maintained on Quay.io
rather on Docker Hub (likely because it's a Red Hat service).

CentOS Linux 8 reaches EOL on 2021-12-31 and is superseeded by Rocky
Linux 8 as alternative bug-for-bug compatible RHEL 8 rebuild.

Fedora Rawhide, 35 and CentOS Stream 9 (development) are currently
broken: https://bugzilla.redhat.com/show_bug.cgi?id=1988199#c13

.github/images/alpine.Dockerfile

@@ -0,0 +1,17 @@
+ARG image=alpine:latest
+FROM $image
+
+# Install dependencies
+RUN apk upgrade
+RUN apk add autoconf automake file gcc gzip libtool make musl-dev
+
+# Add source code
+ADD . /src
+WORKDIR /src
+
+# Run steps
+RUN ./bootstrap
+RUN ./configure
+RUN make
+RUN make check
+RUN make distcheck

.github/images/alpine:3.14.Dockerfile

@@ -0,0 +1 @@
+alpine.Dockerfile

.github/images/alpine:edge.Dockerfile

@@ -0,0 +1 @@
+alpine.Dockerfile

.github/images/centos.Dockerfile

@@ -1,10 +1,9 @@
-ARG image=centos:8
-FROM $image
+ARG image=centos/centos:latest
+FROM quay.io/$image
 
 # Install dependencies
 RUN yum update -y
-RUN yum groupinstall -y 'Development Tools'
-RUN yum install -y autoconf automake findutils libtool
+RUN yum install -y autoconf automake gcc libtool make
 
 # Add source code
 ADD . /src
@@ -16,4 +15,3 @@ RUN ./configure
 RUN make
 RUN make check
 RUN make distcheck
-

.github/images/centos/centos:7.Dockerfile

@@ -0,0 +1 @@
+../centos.Dockerfile

.github/images/centos/centos:stream8.Dockerfile

@@ -0,0 +1 @@
+../centos.Dockerfile

.github/images/centos:7.Dockerfile

@@ -1 +0,0 @@
-centos.Dockerfile

.github/images/centos:8.Dockerfile

@@ -1 +0,0 @@
-centos.Dockerfile

.github/images/fedora/fedora:33.Dockerfile

@@ -0,0 +1 @@
+../centos.Dockerfile

.github/images/fedora/fedora:34.Dockerfile

@@ -0,0 +1 @@
+../centos.Dockerfile

.github/images/fedora:30.Dockerfile

@@ -1 +0,0 @@
-centos.Dockerfile

.github/images/fedora:31.Dockerfile

@@ -1 +0,0 @@
-centos.Dockerfile

.github/images/rockylinux/rockylinux:8.Dockerfile

@@ -0,0 +1 @@
+../centos.Dockerfile

.github/images/ubuntu:focal.Dockerfile

@@ -0,0 +1 @@
+debian.Dockerfile

.github/workflows/matrixbuild.yml

@@ -9,14 +9,18 @@ jobs:
       fail-fast: false
       matrix:
         dockerenv:
+          - debian:bookworm
+          - debian:bullseye
           - debian:buster
-          - debian:stretch
+          - ubuntu:focal
           - ubuntu:bionic
-          - ubuntu:xenial
-          - centos:8
-          - centos:7
-          - fedora:31
-          - fedora:30
+          - fedora/fedora:34
+          - fedora/fedora:33
+          - centos/centos:stream8
+          - centos/centos:7
+          - rockylinux/rockylinux:8
+          - alpine:edge
+          - alpine:3.14
     steps:
     - uses: actions/checkout@v1
     - name: Run build on ${{matrix.dockerenv}}