change to rootful container

Dockerfile

@@ -1,7 +1,10 @@
-FROM docker:20.10.23-dind-rootless
+FROM docker:20.10.23-dind
+
+# Cannot use a rootless container due to permissions errors writing to the
+# workspace
+
 # This is an alpine-based image
 
-USER root
 RUN true && \
     apk add --no-cache curl && \
     apkArch="$(arch)" && \
@@ -9,11 +12,8 @@ RUN true && \
     curl -sLO https://github.com/sigstore/rekor/releases/download/v1.0.1/rekor-cli-linux-${apkArch} && \
     mv rekor-cli-linux-${apkArch} /usr/bin/rekor && \
     chmod 755 /usr/bin/rekor && \
-    addgroup -g 998 docker && \
-    addgroup rootless docker && \
     true
 
 COPY entrypoint.sh /
 
-USER rootless
 ENTRYPOINT ["/entrypoint.sh"]