remove php 7.3-based runtime (EOL at end of 2021)

Author: dgrove-oss

.travis.yml

@@ -41,11 +41,6 @@ deploy:
       tags: true
       all_branches: true
       repo: apache/openwhisk-runtime-php
-  - provider: script
-    script: "./tools/travis/publish.sh openwhisk 7.3 nightly"
-    on:
-      branch: master
-      repo: apache/openwhisk-runtime-php
   - provider: script
     script: "./tools/travis/publish.sh openwhisk 7.4 nightly"
     on:

README.md

@@ -24,7 +24,7 @@
 
 ## PHP versions
 
-This runtime provides PHP 8.0, 7.4 and 7.3.
+This runtime provides PHP 8.0 and 7.4.
 
 ### Give it a try today
 To use as a docker action
@@ -39,11 +39,6 @@ PHP 7.4:
 wsk action update myAction myAction.php --docker openwhisk/action-php-v7.4:latest
 ```
 
-PHP 7.3:
-```
-wsk action update myAction myAction.php --docker openwhisk/action-php-v7.3:latest
-```
-
 This works on any deployment of Apache OpenWhisk
 
 ### To use on deployment that contains the runtime as a kind
@@ -59,29 +54,22 @@ PHP 7.4:
 wsk action update myAction myAction.php --kind php:7.4
 ```
 
-PHP 7.3:
-```
-wsk action update myAction myAction.php --kind php:7.3
-```
-
 ### Local development
 
 ```
 ./gradlew core:php8.0Action:distDocker
 ./gradlew core:php7.4Action:distDocker
-./gradlew core:php7.3Action:distDocker
 ```
-This will produce the images `whisk/action-php-v8.0`, `whisk/action-php-v7.4` & `whisk/action-php-v7.3` respectively.
+This will produce the images `whisk/action-php-v8.0` and `whisk/action-php-v7.4` respectively.
 
 Build and Push image
 ```
 docker login
 ./gradlew core:php8.0Action:distDocker -PdockerImagePrefix=$prefix-user -PdockerRegistry=docker.io
 ./gradlew core:php7.4Action:distDocker -PdockerImagePrefix=$prefix-user -PdockerRegistry=docker.io
-./gradlew core:php7.3Action:distDocker -PdockerImagePrefix=$prefix-user -PdockerRegistry=docker.io
 ```
 
-Deploy OpenWhisk using ansible environment that contains the kinds `php:8.0`, `php:7.4` & `php:7.3`
+Deploy OpenWhisk using ansible environment that contains the kinds `php:8.0` and `php:7.4`
 Assuming you have OpenWhisk already deploy locally and `OPENWHISK_HOME` pointing to root directory of OpenWhisk core repository.
 
 Set `ROOTDIR` to the root directory of this repository.
@@ -112,10 +100,6 @@ docker push $user_prefix/action-php-v8.0
 docker tag whisk/php7.4Action $user_prefix/action-php-v7.4
 docker push $user_prefix/action-php-v7.4
 ```
-```
-docker tag whisk/php7.3Action $user_prefix/action-php-v7.3
-docker push $user_prefix/action-php-v7.3
-```
 
 Then create the action using your image from dockerhub
 ```