Remove EOL Windows 1803-based (SAC) images

See https://docs.microsoft.com/en-us/virtualization/windowscontainers/deploy-containers/base-image-lifecycle (EOL 11/12/2019)

Author: tianon

.travis.yml

@@ -3,18 +3,12 @@ services: docker
 
 matrix:
   include:
-    - os: windows
-      dist: 1803-containers
-      env: VERSION=1.13 VARIANT=windows/windowsservercore-1803
     - os: linux
       env: VERSION=1.13 VARIANT=buster
     - os: linux
       env: VERSION=1.13 VARIANT=stretch
     - os: linux
       env: VERSION=1.13 VARIANT=alpine3.10
-    - os: windows
-      dist: 1803-containers
-      env: VERSION=1.12 VARIANT=windows/windowsservercore-1803
     - os: linux
       env: VERSION=1.12 VARIANT=buster
     - os: linux

1.12/windows/nanoserver-1803/Dockerfile

@@ -78,8 +78,8 @@ for version in "${versions[@]}"; do
 
 	for v in \
 		buster stretch alpine{3.10,3.9} \
-		windows/windowsservercore-{ltsc2016,1803,1809} \
-		windows/nanoserver-{1803,1809} \
+		windows/windowsservercore-{ltsc2016,1809} \
+		windows/nanoserver-1809 \
 	; do
 		dir="$version/$v"
 

1.12/windows/windowsservercore-1803/Dockerfile

@@ -106,8 +106,8 @@ for version in "${versions[@]}"; do
 	done
 
 	for winVariant in \
-		nanoserver-{1803,1809} \
-		windowsservercore-{ltsc2016,1803,1809} \
+		nanoserver-1809 \
+		windowsservercore-{ltsc2016,1809} \
 	; do
 		if [ -d "$version/windows/$winVariant" ]; then
 			sed -r \
@@ -118,7 +118,6 @@ for version in "${versions[@]}"; do
 
 			case "$winVariant" in
 				nanoserver-*) ;; # nanoserver images COPY --from=...:...-windowsservercore-...
-				*-1803) travisEnv='\n    - os: windows\n      dist: 1803-containers\n      env: VERSION='"$version VARIANT=windows/$winVariant$travisEnv" ;;
 				*-1809) ;; # no AppVeyor or Travis support for 1809: https://github.com/appveyor/ci/issues/1885 and https://github.com/appveyor/ci/issues/2676
 				*) appveyorEnv='\n    - version: '"$version"'\n      variant: '"$winVariant$appveyorEnv" ;;
 			esac