Update GitHub actions versions

Author: j8r

.github/workflows/build.yml

@@ -150,22 +150,22 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Set up QEMU
-        uses: docker/setup-qemu-action@v2
+        uses: docker/setup-qemu-action@v3
 
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v2
+        uses: docker/setup-buildx-action@v3
 
       - name: Login to DockerHub
-        uses: docker/login-action@v2
+        uses: docker/login-action@v3
         with:
           username: jrei
           password: ${{ secrets.DOCKER_HUB_TOKEN }}
 
       - name: Build and push ${{ matrix.name }}
-        uses: docker/build-push-action@v3
+        uses: docker/build-push-action@v6
         with:
           context: .
           file: ${{ matrix.dockerfile }}

systemd/centos/7.Dockerfile

@@ -1,6 +1,6 @@
 FROM centos:7
 
-ENV container docker
+ENV container=docker
 
 RUN cd /lib/systemd/system/sysinit.target.wants/; \
     for i in *; do [ $i = systemd-tmpfiles-setup.service ] || rm -f $i; done

systemd/centos/8.Dockerfile

@@ -1,6 +1,6 @@
 FROM centos:8
 
-ENV container docker
+ENV container=docker
 
 RUN cd /lib/systemd/system/sysinit.target.wants/; \
     for i in *; do [ $i = systemd-tmpfiles-setup.service ] || rm -f $i; done