Remove podman option from Makefile and modify html target

CI was failing, removing the podman option from the Makefile and
modifying the html target to run docker in non-interative mode seems to
have resolved the issue.

Signed-off-by: Dylan Reimerink <dylan.reimerink@isovalent.com>

Makefile

@@ -3,11 +3,6 @@
 REPODIR := $(shell dirname $(realpath $(firstword $(MAKEFILE_LIST))))
 UIDGID := $(shell stat -c '%u:%g' ${REPODIR})
 
-# Prefer podman if installed, otherwise use docker.
-# Note: Setting the var at runtime will always override.
-CONTAINER_ENGINE ?= $(if $(shell command -v podman), podman, docker)
-CONTAINER_RUN_ARGS ?= $(if $(filter ${CONTAINER_ENGINE}, podman), --log-driver=none, --user "${UIDGID}")
-
 IMAGE := ghcr.io/isovalent/ebpf-docs
 VERSION := $(shell cat ${REPODIR}/tools/image-version)
 
@@ -20,22 +15,22 @@ default: serve ;
 .PHONY: build-container
 build-container: 
 	$(eval EPOCH := $(shell date +%s))
-	${CONTAINER_ENGINE} build -f ${REPODIR}/tools/Dockerfile -t ${IMAGE}:$(EPOCH) ${REPODIR}
+	docker build -f ${REPODIR}/tools/Dockerfile -t ${IMAGE}:$(EPOCH) ${REPODIR}
 	echo $(EPOCH) > ${REPODIR}/tools/image-version
 
 .PHONY: push-container
 push-container:
-	${CONTAINER_ENGINE} push ${IMAGE}:${VERSION}
+	docker push ${IMAGE}:${VERSION}
 
 .PHONY: container-shell
 container-shell:
-	${CONTAINER_ENGINE} run --rm -it -v "${REPODIR}:/docs" -e "GH_TOKEN=${GH_TOKEN}" \
+	docker run --rm -it -v "${REPODIR}:/docs" -e "GH_TOKEN=${GH_TOKEN}" \
 	-e "AS_USER=$$(id -u $${USER})" -e "AS_GROUP=$$(id -g $${USER})" \
 	-w /docs "${IMAGE}:${VERSION}"
 
 .PHONY: html
 html:
-	${CONTAINER_ENGINE} run --rm -it -v "${REPODIR}:/docs" \
+	docker run --rm -v "${REPODIR}:/docs" \
 	-e "PROD=${PROD}" -e "GH_TOKEN=${GH_TOKEN}" \
 	-e "AS_USER=$$(id -u $${USER})" -e "AS_GROUP=$$(id -g $${USER})" \
 	-w /docs "${IMAGE}:${VERSION}" "mkdocs build -d /docs/out"
@@ -46,19 +41,19 @@ clear-html:
 
 .PHONY: serve
 serve:
-	${CONTAINER_ENGINE} run --rm -it -p 8000:8000 -v "${REPODIR}:/docs" \
+	docker run --rm -p 8000:8000 -v "${REPODIR}:/docs" \
 	-e "PROD=${PROD}" -e "GH_TOKEN=${GH_TOKEN}" \
 	-w /docs -e "AS_USER=$$(id -u $${USER})" -e "AS_GROUP=$$(id -g $${USER})" \
 	"${IMAGE}:${VERSION}" "mkdocs serve -a 0.0.0.0:8000 --watch /docs/docs"
 
 .PHONY: build-spellcheck
 build-spellcheck:
-	${CONTAINER_ENGINE} run --rm -v "${REPODIR}:/docs" -w /docs golang:latest bash -c \
+	docker run --rm -v "${REPODIR}:/docs" -w /docs golang:latest bash -c \
 	"CGO_ENABLED=0 go build -buildvcs=false -o /docs/tools/bin/spellcheck /docs/tools/spellcheck/."
 
 .PHONY: build-gen-tools
 build-gen-tools:
-	${CONTAINER_ENGINE} run --rm -v "${REPODIR}:/docs" -w /docs golang:latest bash -c \
+	docker run --rm -v "${REPODIR}:/docs" -w /docs golang:latest bash -c \
 	"CGO_ENABLED=0 go build -buildvcs=false -o /docs/tools/bin/libbpf-tag-gen /docs/tools/libbpf-tag-gen/. && \
 	CGO_ENABLED=0 go build -buildvcs=false -o /docs/tools/bin/helper-ref-gen /docs/tools/helper-ref-gen/. && \
 	CGO_ENABLED=0 go build -buildvcs=false -o /docs/tools/bin/feature-gen /docs/tools/feature-gen/. && \
@@ -70,7 +65,7 @@ LIBBPF_REF := $(shell cat ${REPODIR}/tools/libbpf-ref)
 
 .PHONY: generate-docs
 generate-docs: build-gen-tools
-	${CONTAINER_ENGINE} run --rm -v "${REPODIR}:/docs" \
+	docker run --rm -v "${REPODIR}:/docs" \
 		-w /docs -e "AS_USER=$$(id -u $${USER})" -e "AS_GROUP=$$(id -g $${USER})" "${IMAGE}:${VERSION}" \
 		"/docs/tools/bin/helper-ref-gen --project-root /docs && \
 		/docs/tools/bin/libbpf-tag-gen --project-root /docs --libbpf-ref '${LIBBPF_REF}' && \
@@ -90,6 +85,6 @@ update-libbpf-ref:
 
 .PHONY: spellcheck
 spellcheck: build-spellcheck html
-	${CONTAINER_ENGINE} run --rm -v "${REPODIR}:/docs" \
+	docker run --rm -v "${REPODIR}:/docs" \
 		-w /docs -e "AS_USER=$$(id -u $${USER})" -e "AS_GROUP=$$(id -g $${USER})" "${IMAGE}:${VERSION}" \
 		"/docs/tools/bin/spellcheck --project-root /docs"