Correct Nginx and Alpine version in legacy branch (#7736)

Author: jrushank

images/nginx/rootfs/Dockerfile

@@ -13,7 +13,7 @@
 # limitations under the License.
 
 
-FROM alpine:3.13 as builder
+FROM alpine:3.14.2 as builder
 
 COPY . /
 
@@ -23,7 +23,7 @@ RUN apk update \
   && /build.sh
 
 # Use a multi-stage build
-FROM alpine:3.13
+FROM alpine:3.14.2
 
 ENV PATH=$PATH:/usr/local/luajit/bin:/usr/local/nginx/sbin:/usr/local/nginx/bin
 

images/nginx/rootfs/build.sh

@@ -18,7 +18,7 @@ set -o errexit
 set -o nounset
 set -o pipefail
 
-export NGINX_VERSION=1.20.1
+export NGINX_VERSION=1.19.9
 
 # Check for recent changes: https://github.com/vision5/ngx_devel_kit/compare/v0.3.1...master
 export NDK_VERSION=0.3.1
@@ -190,7 +190,7 @@ mkdir --verbose -p "$BUILD_PATH"
 cd "$BUILD_PATH"
 
 # download, verify and extract the source files
-get_src e462e11533d5c30baa05df7652160ff5979591d291736cfa5edb9fd2edb48c49 \
+get_src 2e35dff06a9826e8aca940e9e8be46b7e4b12c19a48d55bfc2dc28fc9cc7d841 \
         "https://nginx.org/download/nginx-$NGINX_VERSION.tar.gz"
 
 get_src 0e971105e210d272a497567fa2e2c256f4e39b845a5ba80d373e26ba1abfbd85 \