fix(ci): Stop building unbuildable image based on centos7 (#553)

It looks like at least one mirror/package we need is no longer
installable, so we can no longer rebuild the centos7 image weekly with
the rest of the images. (We can still pull the existing image for
testing, though).

Author: paleolimbot

.github/workflows/docker-build.yaml

@@ -42,12 +42,10 @@ jobs:
           - { runs_on: "ubuntu-latest", platform: "fedora", arch: "amd64" }
           - { runs_on: "ubuntu-latest", platform: "archlinux", arch: "amd64" }
           - { runs_on: "ubuntu-latest", platform: "alpine", arch: "amd64" }
-          - { runs_on: "ubuntu-latest", platform: "centos7", arch: "amd64" }
 
           - { runs_on: ["self-hosted", "arm"], platform: "ubuntu", arch: "arm64" }
           - { runs_on: ["self-hosted", "arm"], platform: "fedora", arch: "arm64" }
           - { runs_on: ["self-hosted", "arm"], platform: "alpine", arch: "arm64" }
-          - { runs_on: ["self-hosted", "arm"], platform: "centos7", arch: "arm64" }
 
           - { runs_on: "ubuntu-latest", platform: "alpine", arch: "s390x" }
 
@@ -122,17 +120,6 @@ jobs:
           ghcr.io/apache/arrow-nanoarrow:ubuntu \
           ghcr.io/apache/arrow-nanoarrow:ubuntu-arm64 --arch arm64
 
-        docker manifest create \
-          ghcr.io/apache/arrow-nanoarrow:centos7 \
-          ghcr.io/apache/arrow-nanoarrow:centos7-amd64 \
-          ghcr.io/apache/arrow-nanoarrow:centos7-arm64
-        docker manifest annotate \
-          ghcr.io/apache/arrow-nanoarrow:centos7 \
-          ghcr.io/apache/arrow-nanoarrow:centos7-amd64 --arch amd64
-        docker manifest annotate \
-          ghcr.io/apache/arrow-nanoarrow:centos7 \
-          ghcr.io/apache/arrow-nanoarrow:centos7-arm64 --arch arm64
-
         docker manifest create \
           ghcr.io/apache/arrow-nanoarrow:fedora \
           ghcr.io/apache/arrow-nanoarrow:fedora-amd64 \
@@ -164,5 +151,4 @@ jobs:
       run: |
         docker manifest push ghcr.io/apache/arrow-nanoarrow:ubuntu
         docker manifest push ghcr.io/apache/arrow-nanoarrow:fedora
-        docker manifest push ghcr.io/apache/arrow-nanoarrow:centos7
         docker manifest push ghcr.io/apache/arrow-nanoarrow:alpine