refactor: simplify Dockerfile and begin using unified base image (#1247)

The unified based image provides all hardware acceleration methods, so
users will not have install specific hardware variants.

Hardware-specific images will be published for a short time in order to
provide warnings to existing users to migrate their install over to the
non-suffixed version.

Thank you to @jasongdove for his hard work on the base image!

.github/workflows/build-and-push-docker.yml

@@ -43,25 +43,25 @@ jobs:
       max-parallel: 2
       matrix:
         builds:
-          - base_tag: '7.0'
+          - base_tag: '7.1.1'
             platform: linux/amd64
             suffix:
             target: linux-x64
             os: ubuntu-latest
 
-          - base_tag: 7.0-nvidia
+          - base_tag: 7.1.1-nvidia
             platform: linux/amd64
             suffix: -nvidia
             target: linux-x64
             os: ubuntu-latest
 
-          - base_tag: 7.0-vaapi
+          - base_tag: 7.1.1-vaapi
             platform: linux/amd64
             suffix: -vaapi
             target: linux-x64
             os: ubuntu-latest
 
-          - base_tag: 7.0-arm64
+          - base_tag: 7.1.1-arm64
             platform: linux/arm64
             suffix: -arm64
             target: linux-arm64