Support selection of container image

Dockerfile

@@ -1,4 +1,4 @@
-FROM sphinxdoc/sphinx:latest
+FROM sphinxdoc/sphinx:2.4.4
 
 LABEL "maintainer"="Ammar Askar <[email protected]>"
 

Dockerfile.pdflatex

@@ -0,0 +1,8 @@
+FROM sphinxdoc/sphinx-pdflatex:4.3.2
+
+LABEL "maintainer"="Ammar Askar <[email protected]>"
+
+ADD entrypoint.py /entrypoint.py
+ADD sphinx_action /sphinx_action
+
+ENTRYPOINT ["/entrypoint.py"]

Dockerfile.sphinx4

@@ -0,0 +1,8 @@
+FROM sphinxdoc/sphinx:4.3.2
+
+LABEL "maintainer"="Ammar Askar <[email protected]>"
+
+ADD entrypoint.py /entrypoint.py
+ADD sphinx_action /sphinx_action
+
+ENTRYPOINT ["/entrypoint.py"]

action.yml

@@ -32,6 +32,25 @@ inputs:
       A list of additional 'apt' packages to install before running
       sphinx. (Setting this will force-enable 'update' as well.)
     required: false
+  sphinx4:
+    description:
+      Use a newer container image based on Sphinx version 4.
+    required: false
+    default: false
+  pdflatex:
+    description:
+      Run the build in a container image based on sphinx version 4,
+      with additional dependencies only needed when generating PDFs.
+    required: false
+    default: false
 runs:
-  using: 'docker'
-  image: 'Dockerfile'
+  - using: 'docker'
+    if: ${{ inputs.sphin4 == false && inputs.pdflatex == false }}
+    image: 'Dockerfile'
+  - using: 'docker'
+    if: ${{ inputs.sphinx4 == true && inputs.pdflatex == false }}
+    image: 'Dockerfile.sphinx4'
+  - using: 'docker'
+    if: ${{ inputs.pdflatex == true }}
+    image: 'Dockerfile.pdflatex'
+