This works for posting an image to bsky from the CLI

bsky_image.zsh

accessJwt=$(curl -X POST https://bsky.social/xrpc/com.atproto.server.createSession \
    -H "Content-Type: application/json" \
    -d '{"identifier": "'"$BLUESKY_HANDLE"'", "password": "'"$BLUESKY_APP_PASSWORD"'"}' | jq -j ".accessJwt")


blob=$(curl -X POST 'https://bsky.social/xrpc/com.atproto.repo.uploadBlob' \
        -H "Authorization: Bearer $accessJwt" \
        -H 'Content-Type: image/jpeg' \
        --data-binary "@alf.jpg" | jq -r ".blob")

# link=$(echo "$blob" | jq -r '.blob.ref."$link"')
# size=$(echo "$blob" | jq -r '.blob.size')

text="I've always been sensual."

curl -X POST https://bsky.social/xrpc/com.atproto.repo.createRecord \
     -H "Authorization: Bearer $accessJwt" \
     -H "Content-Type: application/json" \
     -d "{ \"repo\": \"$BLUESKY_HANDLE\", \"collection\": \"app.bsky.feed.post\", \"record\": { \"text\": \"$text\", \"embed\": { \"\$type\": \"app.bsky.embed.images\", \"images\": [{ \"alt\": \"Sensual Alf\", \"image\": $blob }] }, \"createdAt\": \"1986-09-22T21:00:00.001Z\" }}"