feat(Dockerfile): set used tf versions

We need versions defined in our `atlantis.yaml` on `anu`. Add latest
stable as well for updates.

Dockerfile

@@ -100,9 +100,9 @@ RUN case ${TARGETPLATFORM} in \
     mv git-lfs /usr/bin/git-lfs && \
     git-lfs --version
 
-# In the official Atlantis image, we only have the latest of each Terraform version.
-# Each binary is about 80 MB so we limit it to the 4 latest minor releases or fewer
-RUN AVAILABLE_TERRAFORM_VERSIONS="1.3.10 1.4.6 1.5.7" && \
+# Each binary is about 80 MB so we limit it to the versions we need, plus the
+# latest stable version
+RUN AVAILABLE_TERRAFORM_VERSIONS="0.12.31 0.13.7 1.3.7 1.4.6 1.5.2 1.7.5" && \
     case "${TARGETPLATFORM}" in \
         "linux/amd64") TERRAFORM_ARCH=amd64 ;; \
         "linux/arm64") TERRAFORM_ARCH=arm64 ;; \